Honda Power Equipment GX25-GX35 Automobile User Manual
Contents
1. PRE iS Ss 1S e7 E I p ka P FILTER ELEMENT FILTER ELEMENT GX35 Standard Tiller type FILTER ELEMENT 4 Reinstall the filter element and air cleaner cover securely LOWER TABS UPPER TAB AIR CLEANER COVER LOWER TABS AIR CLEANER COVER GX35 Standard Tiller type UPPER LATCH TAB AIR CLEANER BODY CHOKE LEVER aa 7 Ya Mie SHE Ep D G IE D p yw a p 4 EATA if 7 JON a A AIR CLEANER COVER A amp f UPPER LATCH TAB A F X A USSF hp WY Ng FILTER ELEMENT LOWER TABS 10 ENGLISH Zon 05 12 16 15 01 11 32Z6J600_011 SPARK PLUG Recommended Spark Plug CM5H NGK CMR5H NGK The recommended spark plug is the correct heat range for normal engine operating temperatures NOTICE An incorrect spark plug can cause engine damage For good performance the spark plug must be properly gapped and free of deposits 1 Remove the top cover Loosen the 5 mm hex bolt with a hexagon wrench then remove the top cover A CAUTION Do not operate the engine when the top cover is removed Do not pull the recoil starter handle when the top cover is removed You may be injured from the rotating parts or burned by the muffler TOP COVER 5 mm HEX BOLT 2 Disconnect the spark plug cap and remove any dirt from around the spark plug area 3 Remove the spark plug with a 5 8 inch spark plug wrench SPARK PLUG SPARK PLUG CAP D 42. 05 12 16 14 58 13 32Z63600 001 INTRODUCTION Thank you for purchasing a Honda engine We want to help you to get the best results from your new engine and to operate it safely This manual contains information on how to do that please read it carefully before operating the engine If a problem should arise or if you have any questions about your engine consult an authorized Honda servicing dealer All information in this publication is based on the latest product information available at the time of printing Honda Motor Co Ltd reserves the right to make changes at any time without notice and without incurring any obligation No part of this publication may be reproduced without written permission This manual should be considered a permanent part of the engine and should remain with the engine if resold Review the instructions provided with the equipment powered by this engine for any additional information regarding engine startup shutdown operation adjustments or any special maintenance instructions United States Puerto Rico and U S Virgin Islands We suggest you read the warranty policy to fully understand its coverage and your responsibilities of ownership The warranty policy is a separate document that should have been given to you by your dealer SAFETY MESSAGES Your safety and the safety of others is very important We have provided important safety messages in this manual and on the engine Pleas
3. ENGLISH 11 HD AA T 05 12 16 20 37 16 32Z6J600_012 FUEL FILTER AND FUEL TANK Fuel filter inspection and Fuel tank cleaning A WARNING Gasoline is highly flammable and explosive and you can be burned or seriously injured when handling fuel e Stop engine and keep heat sparks and flame away e Handle fuel only outdoors e Wipe up spills immediately 1 Check that the engine oil filler cap is tightened securely 2 Remove the fuel filler cap and drain the fuel into an approved gasoline container by tipping the engine toward the fuel filler neck ENGINE OIL FILLER CAP FUEL FILLER NECK 3 Pull the fuel filter out through the fuel filler neck by hooking the black fuel tube with a piece of wire such as a partly straightened paper clip 4 Inspect the fuel filter If the fuel filter is dirty wash it gently with nonflammable or high flashpoint solvent If the fuel filter is excessively dirty replace it FUEL FILTER 5 Remove water and dirt from in the fuel tank by rinsing the inside of the fuel tank with nonflammable or high flash point solvent 6 Insert the fuel filter into the fuel tank and tighten the fuel filler cap securely p SPARK ARRESTER applicable types The spark arrester may be standard or an optional part depending on the engine type In some areas it is illegal to operate an engine without a spark arrester Check local laws and regulations A spark
4. MAINTENANCE SCHEDULE REGULAR SERVICE PERIOD 3 Perform at every Each First Every 3 Every 6 Every Every2 Refer indicated month or use month months months year years to operating hour interval or or or or or Page whichever comes first 10hrs 25hrs 50hrs 100hrs 300 hrs ITEM Engine oil Check level 0 9 Change ie fe Air cleaner Check fe 10 Clean o 1 Spark plug Check adjust 0 11 Replace fe Spark arrester Clean fe 12 14 Applicable types Engine cooling Check fo 11 fins Nuts bolts Check Oo 4 fasteners Retighten if necessary Clutch shoes Check O 2 Shop manual Idle speed Check adjust O 2 Shop manual Valve Check adjust O 2 Shop clearance manual Combustion Clean After every 300 hrs 2 Shop chamber manual Fuel filter Check O 12 Fuel tank Clean O 12 Fuel tubes Check Every 2 years Replace if necessary 2 Shop manual Oil tube Check Every 2 years Replace if necessary 2 Shop manual 1 Service more frequently when used in dusty areas 2 These items should be serviced by your servicing dealer unless you have the proper tools and are mechanically proficient Refer to Honda shop manual for service procedures 3 For commercial use log hours of operation to determine proper maintenance intervals Failure to follow this maintenance schedule could result in non warrantable failures
5. ENGLISH 7 HD D 05 12 16 15 00 13 32Z6J600_008 REFUELING Recommended Fuel Unleaded gasoline U S Pump octane rating 86 or higher Except U S Research octane rating 91 or higher Pump octane rating 86 or higher This engine is certified to operate on unleaded gasoline Unleaded gasoline produces fewer engine and spark plug deposits and extends exhaust system life A WARNING Gasoline is highly flammable and explosive and you can be burned or seriously injured when refueling e Stop engine and keep heat sparks and flame away e Refuel only outdoors e Wipe up spills immediately NOTICE Fuel can damage paint and some types of plastic Be careful not to spill fuel when filling your fuel tank Damage caused by spilled fuel is not covered under the Distributor s Limited Warranty Never use stale or contaminated gasoline or oil gasoline mixture Avoid getting dirt or water in the fuel tank Occasionally you may hear a light spark knock or pinging metallic rapping noise while operating under heavy loads This is no cause for concern If spark knock or pinging occurs at a steady engine speed under normal load change brands of gasoline If spark knock or pinging persists see an authorized Honda servicing dealer NOTICE Running the engine with persistent spark knock or pinging can cause engine damage Running the engine
6. Width 234 mm 243 mm 243 mm 9 2 in 9 6 in 9 6 in Height 240 mm 242 mm 242 mm 9 4 in 9 5 in 9 5 in Dry weight 3 33 kg 3 52 kg 3 52 kg Without clutch 7 34 lbs 7 76 Ibs 7 76 Ibs Engine type 4 stroke overhead camshaft single cylinder Displacement Bore X Stroke 35 8 cm 2 18 cu in 39 X 30 mm 1 5 X 1 2 in Max output 1 2 kW 1 6 PS 1 6 bhp at 7 000 rpm Max torque 1 9 N m 0 19 kgf m 1 4 Ibf ft at 5 500 rpm Engine oil 0 10 2 0 11 US qt 0 09 Imp qt capacity Fuel tank 0 65 2 0 172 US gal 0 143 Imp gal capacity Fuel consumption 360 g kWh 265 g PSh 0 59 Ib hph Cooling system Forced air Ignition system Transistorized magneto PTO shaft rotation Counterclockwise 18 ENGLISH HD AVA as 05 12 16 15 03 56 32Z63600 019 Tuneup Specifications r ITEM SPECIFICATION MAINTENANCE Spark plug gap 0 60 0 70 mm 0 024 0 028 in Refer to page 11 Idle speed 3 100 200 rpm See your Valve clearance cold IN 0 08 0 02 mm EX 0 11 0 02 mm authorized Honda dealer Other specifications No other adjustments needed Quick Reference Information Fuel Unleaded gasoline Refer to page 8 U S Pump octane rating 86 or higher Except Research octane rating 91 or higher U S Pump octane rating 86 or higher Engine oil S
7. ENGINE 6 THE IMPORTANCE OF MAINTENANCE eee 6 MAINTENANCE SAFETYV 6 SAFETY PRECAUTIONG 7 MAINTENANCE the word NOTICE SCHEDULE gaiesa 7 REFUELING isusuot 8 This word means ENGINE Ol ise isesciviscvesevetcsree 8 NOTICE Your engine or other property can be damaged if you Recommended Oil 8 don t follow instructions Oil Level Check eee 9 Oil Change issnin 9 The purpose of these messages is to help prevent damage to your AIR CLEANER siesisiersssisesaia 10 engine other property or the environment INSPECTION sieis 10 Cleaning saceeenceecvansensvaesevece 10 2005 Honda Motor Co Ltd All Rights Reserved GX25NT GX35NT 37Z6J601 00X37 Z6J 6010 ENGLISH pe SPARK PLUG eee 11 COOLING FINS 11 FUEL FILTER AND FUEL TANK os tnt sencicectecechstveaseescees ccs 12 SPARK ARRESTER 65 12 HELPFUL TIPS amp SUGGESTIONS v sana 14 STORING YOUR ENGINE 14 TRANSPORTING ee 15 TAKING CARE OF UNEXPECTED PROBLEMS 16 TECHNICAL amp CONSUMER INFORMATION c0c0cceee 16 Serial Number Location 16 Remote Control Linkage 16 Carburetor Modifications for High Altitude Operation 17 Oxygenated Fuels 17 Emission Control System Information soisissa 17 Air INGOX ccccceeeeeeeeeeeeeeees 18 Specifications sss 18 Tuneup Specifications 19 Quick Reference Information ceeeeeeseeeeeee 19 Wiring
8. Inspect the spark plug Replace it if damaged or badly fouled if the sealing washer is in poor condition or if the electrode is worn SIDE ELECTRODE 0 60 0 70 mm 0 024 0 028 in 5 Measure the spark plug electrode gap with a wire type feeler gauge Correct the gap if necessary by carefully bending the side electrode The gap should be 0 60 0 70 mm 0 024 0 028 in SEALING WASHER 6 Install the spark plug carefully by hand to avoid cross threading 7 After the spark plug is seated tighten with a 5 8 inch spark plug wrench to compress the sealing washer 8 When installing a new spark plug tighten 1 2 turn after the spark plug seats to compress the washer 9 When reinstalling the original spark plug tighten 1 8 1 4 turn after the spark plug seats to compress the washer NOTICE A loose spark plug can overheat and damage the engine Overtightening the spark plug can damage the threads in the cylinder head 10 Attach the spark plug cap to the spark plug 11 Install the top cover and tighten the 5 mm hex bolt securely with a hexagon wrench COOLING FINS Inspection 1 Loosen the 5 mm hex bolt then remove the top cover 2 Disconnect the spark plug cap 3 Inspect the engine cooling fins and clean out debris if necessary SPARK PLUG CAP COOLING FINS 4 Reconnect the spark plug cap 5 Install the top cover and tighten the 5 mm hex bolt securely
9. control systems The following instructions and procedures must be followed in order to keep the emissions from your Honda engine within the emission standards Tampering and Altering Tampering with or altering the emission control system may increase emissions beyond the legal limit Among those acts that constitute tampering are e Removal or alteration of any part of the intake fuel or exhaust systems e Altering or defeating the governor linkage or speed adjusting mechanism to cause the engine to operate outside its design parameters Problems That May Affect Emissions If you are aware of any of the following symptoms have your engine inspected and repaired by your servicing dealer e Hard starting or stalling after starting e Rough idle e Misfiring or backfiring under load e Afterburning backfiring e Black exhaust smoke or high fuel consumption Replacement Parts The emission control systems on your Honda engine were designed built and certified to conform with EPA California and Canadian emission regulations We recommend the use of genuine Honda parts whenever you have maintenance done These original design replacement parts are manufactured to the same standards as the original parts so you can be confident of their performance The use of replacement parts that are not of the original design and quality may impair the effectiveness of your emission control system A manufacturer of an aftermarket part a
10. engines eu com All Other Areas Please contact the Honda distributor in your area for assistance HONDA The Power of Dreams 20 ENGLISH HD AA as
11. 2 Turn the engine switch to the OFF position OFF OFF ON ENGINE SWITCH SERVICING YOUR ENGINE THE IMPORTANCE OF MAINTENANCE Good maintenance is essential for safe economical and trouble free operation It will also help reduce pollution A WARNING Improper maintenance or failure to correct a problem before operation can cause a malfunction in which you can be seriously hurt or killed Always follow the inspection and maintenance recommendations and schedules in this owner s manual To help you properly care for your engine the following pages include a maintenance schedule routine inspection procedures and simple maintenance procedures using basic hand tools Other service tasks that are more difficult or require special tools are best handled by professionals and are normally performed by a Honda technician or other qualified mechanic The maintenance schedule applies to normal operating conditions If you operate your engine under severe conditions such as sustained high load or high temperature operation or use in unusually wet or dusty conditions consult your servicing dealer for recommendations applicable to your individual needs and use Maintenance replacement or repair of the emission control devices and systems may be performed by any engine repair establishment or individual using parts that are certified to EPA standards MAINTENANCE SAFETY Some of the most import
12. 2Z6J600_010 AIR CLEANER A dirty air cleaner will restrict air flow to the carburetor reducing engine performance If you operate the engine in very dusty areas clean the air filter element more often than specified in the MAINTENANCE SCHEDULE NOTICE Operating the engine without an air filter element or with a damaged air filter element will allow dirt to enter the engine causing rapid engine wear This type of damage is not covered by the Distributor s Limited Warranty Inspection Press the latch tab on the top of the air cleaner cover and remove the cover Inspect the filter element Clean or replace dirty filter elements Always replace damaged filter elements Refer to this page for instructions that apply to the air cleaner and filter service Reinstall the filter element and air cleaner cover GX25 Standard Pump type Tiller type AIR CLEANER BODY UPPER TAB AIR CLEANER BODY CHOKE LEVER UPPER TAB FILTER ELEMENT Cleaning 1 Clean the filter element in warm soapy water rinse and allow to dry thoroughly Or clean in nonflammable solvent and allow to dry 2 Dip the filter element in clean engine oil then squeeze out all excess oil The engine will smoke when started if too much oil is left in the foam 3 Wipe dirt from the air cleaner body and cover using a moist rag Be careful to prevent dirt from entering the carburetor GX25 Standard Pump type Tiller type
13. 5 MTBE by volume METHANOL methyl or wood alcohol 5 by volume You may use gasoline containing up to 5 methanol by volume as long as it also contains cosolvents and corrosion inhibitors to protect the fuel system Gasoline containing more than 5 methanol by volume may cause starting and or performance problems It may also damage metal rubber and plastic parts of your fuel system If you notice any undesirable operating symptoms try another service station or switch to another brand of gasoline Fuel system damage or performance problems resulting from the use of an oxygenated fuel containing more than the percentages of oxygenates mentioned above are not covered under the Distributor s Limited Warranty Emission Control System Information Source of Emissions The combustion process produces carbon monoxide oxides of nitrogen and hydrocarbons Control of hydrocarbons and oxides of nitrogen is very important because under certain conditions they react to form photochemical smog when subjected to sunlight Carbon monoxide does not react in the same way but it is toxic Honda utilizes lean carburetor settings and other systems to reduce the emissions of carbon monoxide oxides of nitrogen and hydrocarbons The U S California Clean Air Acts and Environment Canada EPA California and Canadian regulations require all manufacturers to furnish written instructions describing the operation and maintenance of emission
14. AE 10W 30 API SJ or SL for general use Refer to page 8 Spark plug CMS5H NGK CMRS5H NGK Maintenance Before each use e Check engine oil level Refer to page 9 e Check air filter Refer to page 10 First 10 hours Change engine oil Refer to page 9 Subsequent Refer to the maintenance schedule on page 7 Wiring Diagrams Standard Tiller type BI Pump type 1 SPARK PLUG 2 IGNITION COIL 3 Engine switch on the equipment powered by the engine 4 ENGINE SWITCH BI Black ENGLISH 19 LD as 05 12 16 15 04 22 32Z63600 020 CONSUMER INFORMATION Distributor Dealer Locator Information United States Puerto Rico and U S Virgin Islands Call 800 426 7701 or visit our website www honda engines com Canada Call 888 SHONDAY or visit our website www honda ca For European Area visit our website http www honda engines eu com Customer Service Information Servicing dealership personnel are trained professionals They should be able to answer any question you may have If you encounter a problem that your dealer does not solve to your satisfaction please discuss it with the dealership s management The Service Manager General Manager or Owner can help Almost all problems are solved in this way United States Puerto Rico and U S Virgin Islands If you are dissat
15. Diagrams sese 19 CONSUMER INFORMATION 20 Distributor Dealer Locator Information ccceeeeeeeeseeeee 20 Customer Service Information cceeeesseeeeeeee 20 1 ESPANOL ac 2 z Oo Z m 2 q OC Z lt q cc Te LD as P 05 12 16 14 58 25 32Z63600 002 SAFETY INFORMATION e Understand the operation of all controls and learn how to stop the engine quickly in case of emergency Make sure the operator receives adequate instruction before operating the equipment e Do not allow children to operate the engine Keep children and pets away from the area of operation e Your engine s exhaust contains poisonous carbon monoxide Do not run the engine without adequate ventilation and never run the engine indoors e The engine and exhaust become very hot during operation Keep the engine at least 1 meter 3 feet away from buildings and other equipment during operation Keep flammable materials away and do not place anything on the engine while it is running SAFETY INDICATION LOCATION Standard Pump type READ OWNER S MANUAL BEFORE OPERATION Tiller type READ OWNER S MANUAL BEFORE OPERATION COMPONENT amp CONTROL LOCATION SPARK PLUG Standard Pump type p YP inside the top cover OIL FILLER CAP TOP COVER MUFFLER A inside the top cover STARTER GRIP OIL FILLER CAP DIPSTICK FUEL TANK TANK GUARD applicable type ENG
16. EED Standard Tiller type Position the throttle lever for the desired engine speed The throttle lever shown here will be connected to a remote control on the equipment powered by this engine Refer to the instructions provided with the equipment for remote control information and for engine speed recommendations THROTTLE LEVER L Pump type Position the throttle lever for the desired engine speed For engine speed recommendations refer to the instructions provided with the equipment powered by this engine E ha a RPM MIN vax MIN THROTTLE LEVER ENGLISH HD AA T 05 12 16 14 59 35 32Z63600 006 STOPPING THE ENGINE Standard Tiller type To stop the engine in an emergency simply turn the engine switch on the equipment to the OFF position Under normal conditions use the following procedure 1 Move the throttle lever to the MIN position The throttle lever shown here will be connected to a remote control on the equipment powered by this engine Refer to the instructions provided with the equipment for remote control information and for engine speed recommendations THROTTLE LEVER 2 Turn the engine switch on the equipment to the OFF position Pump type To stop the engine in an emergency simply turn the engine switch to the OFF position Under normal conditions use the following procedure 1 Move the throttle lever to the MIN position MIN THROTTLE LEVER
17. ER MUFFLER Spark Arrester Cleaning amp Inspection 1 Use a brush to remove carbon deposits from the spark arrester screen Be careful to avoid damaging the screen The spark arrester must be free of breaks and holes Replace the spark arrester if it is damaged SPARK ARRESTER SCREEN 2 Install the spark arrester in the reverse order of disassembly 3 Install the top cover and tighten the 5 mm hex bolt securely see page 11 GX35 Standard Type Spark Arrester Removal 1 Loosen the 5 mm hex bolt then remove the top cover see page 11 2 Remove the 4 X 6 mm self tapping screws from the spark arrester and remove the spark arrester and exhaust filter from the muffler SPARK PLUG MUFFLER SPARK ARRESTER OUTLET EXHAUST FILTER 4 X 6mm i SELF TAPPING SCREWS SPARK ARRESTER Exhaust Filter Cleaning amp Inspection Pinch the exhaust filter strike lightly with a finger and remove carbon deposits Be careful not to strike strongly The exhaust filter must be free of breaks and holes If it is damaged or fouled excessively have it serviced by your Honda dealer Spark Arrester Cleaning amp Inspection 1 Use a brush to remove carbon deposits from the spark arrester screen Be careful to avoid damaging the screen The spark arrester must be free of breaks and holes Replace the spark arrester if it is damaged SPARK ARRESTER SCREEN LSS 2 Install the exhaust filter and s
18. INE CONTROLS Standard type CHOKE LEVER THROTTLE LEVER Pump type The illustrations in this manual are based on GX25 e The illustrations may vary according to the type THROTTLE LEVER ENGINE SWITCH 2 ENGLISH AVA T 05 12 16 14 58 34 32Z6J600_003 Tiller type TOP COVER AIR CLEANER STARTER GRIP PRIMING BULB OIL FILLER CAP DIPSTICK MUFFLER inside the top cover ENGINE CONTROLS GX25 GX35 RECOIL STARTER FUEL TANK FUEL FILLER CAP SPARK PLUG CHOKE LEVER inside the top cover THROTTLE LEVER THROTTLE LEVER O FEATURES Centrifugal Clutch Standard Tiller type The centrifugal clutch automatically engages and transmits power when engine speed is increased above approximately 4 200 rpm At idle speed the clutch is disengaged NOTICE Do not run the engine without mounting it on equipment that includes the centrifugal clutch drum and housing or centrifugal force will cause the clutch shoes to contact and damage the engine case ENGLISH 3 Zon P 05 12 16 14 58 55 32Z6J600_004 BEFORE OPERATION CHECKS IS YOUR ENGINE READY TO GO For your safety and to maximize the service life of your equipment it is very important to take a few moments before you operate the engine to check its condition Be sure to take care of any problem you find or have your servicing dealer correct it before you operate the en
19. ONS Before operating the engine for the first time please review the SAFETY INFORMATION section on page 2 and the BEFORE OPERATION CHECKS A WARNING Carbon monoxide gas is toxic Breathing it can cause unconsciousness and even kill you Avoid any areas or actions that expose you to carbon monoxide Review the instructions provided with the equipment powered by this engine for any safety precautions that should be observed with engine startup shutdown or operation STARTING THE ENGINE 1 To start a cold engine move the choke lever to the CLOSED position To restart a warm engine leave the choke lever in the OPEN position CHOKE LEVER CLOSED 2 Press the priming bulb repeatedly until fuel can be seen in the clear plastic fuel return tube FUEL RETURN TUBE clear plastic tube PRIMING BULB 3 e Standard Tiller type Turn the engine switch on the equipment to the ON position e Pump type Turn the engine switch to the ON position O OFF ENGINE SWITCH 4 ENGLISH HD LD as P 05 12 16 14 59 18 32Z6J600_005 4 Pull the starter grip lightly until you feel resistance then pull briskly Return the starter grip gently Standard Pump type Tiller type STARTER GRIP STARTER GRIP EQUIPMENT SIDE NOTICE Do not allow the starter grip to snap back against the engine Return it gently to prevent damage to the starter 5 If the choke lever was mov
20. SJ SL or equivalent Always check the API service label on the oil 20 0 20 40o 60o 80 100 F container to be sure itincludes 30 20 10 o 10 20 30 40C the letters SJ SL or equivalent AMBIENT TEMPERATURE SAE 10W 30 is recommended for general use Other viscosities shown in the chart may be used when the average temperature in your area is within the indicated range Standard Tiller type The recommended operating range of this engine is 5 C to 40 C 23 F to 104 F Pump type The recommended operating range of this engine is 5 C to 40 C 41 F to 104 F 8 ENGLISH HD AVA as 05 12 16 15 00 32 32Z6J600_009 Oil Level Check Check the engine oil level before each use or every 10 hours if operated continuously Check the engine oil level with the engine stopped and in a level position 1 Remove the oil filler cap dipstick and wipe it clean 2 Insert and remove the oil filler cap dipstick without screwing it into the oil filler neck then remove it to check the oil level shown on the dipstick 3 If the oil level is near or below the lower limit mark on the dipstick fill to the bottom edge of the oil fill hole with the recommended oil see page 8 To avoid overfilling or underfilling be sure the engine is in a level position as shown while adding oil OIL FILLER CAP DIPSTICK LOWER LIMIT OIL FILL HOLE bottom edge 4 Reinstall the oil filler cap dipstick and tigh
21. ant safety precautions follow However we cannot warn you of every conceivable hazard that can arise in performing maintenance Only you can decide whether or not you should perform a given task A WARNING Failure to properly follow maintenance instructions and precautions can cause you to be seriously hurt or killed Always follow the procedures and precautions in this owner s manual ENGLISH HD LD ae r 05 12 16 14 59 53 32Z63600 007 SAFETY PRECAUTIONS Make sure the engine is off before you begin any maintenance or repairs This will eliminate several potential hazards Carbon monoxide poisoning from engine exhaust Be sure there is adequate ventilation whenever you operate the engine Burns from hot parts Let the engine and exhaust system cool before touching Injury from moving parts Do not run the engine unless instructed to do so Read the instructions before you begin and make sure you have the tools and skills required To reduce the possibility of fire or explosion be careful when working around gasoline Use only a nonflammable solvent not gasoline to clean parts Keep cigarettes sparks and flames away from all fuel related parts Remember that an authorized Honda servicing dealer knows your engine best and is fully equipped to maintain and repair it To ensure the best quality and reliability use only new genuine Honda parts or their equivalents for repair and replacement
22. arrester is available from authorized Honda servicing dealers The spark arrester must be serviced every 100 hours to keep it functioning as designed If the engine has been running the muffler will be hot Allow it to cool before servicing the spark arrester GX25 Standard Pump type Spark Arrester Removal 1 Loosen the 5 mm hex bolt then remove the top cover see page 11 2 Remove the 4 mm screws from the spark arrester and remove the spark arrester from the muffler MUFFLER SPARK PLUG 4 mm SCREWS SPARK ARRESTER Spark Arrester Cleaning amp Inspection 1 Use a brush to remove carbon deposits from the spark arrester screen Be careful to avoid damaging the screen The spark arrester must be free of breaks and holes Replace the spark arrester if it is damaged SPARK ARRESTER SCREEN 2 Install the spark arrester in the reverse order of disassembly When you install the spark arrester the spark arrester s outlet must point to the side opposite the spark plug 3 Install the top cover and tighten the 5 mm hex bolt securely see page 11 12 ENGLISH HD T T p 05 12 19 14 39 29 32Z63600 013 Tiller type Spark Arrester Removal 1 Loosen the 5 mm hex bolt then remove the top cover see page 11 2 Remove the 3 X 6 mm self tapping screws from the spark arrester and remove the spark arrester from the muffler 3 xX 6mm SELF TAPPING SCREW SPARK ARREST
23. e read these messages carefully A safety message alerts you to potential hazards that could hurt you or others Each safety message is preceded by a safety alert symbol 4 amp and one of three words DANGER WARNING or CAUTION These signal words mean A DANGER A CAUTION Each message tells you what the hazard is what can happen and what you can do to avoid or reduce injury You WILL be KILLED or SERIOUSLY HURT if you don t follow instructions You CAN be KILLED or SERIOUSLY HURT if you don t follow instructions You CAN be HURT if you don t follow instructions DAMAGE PREVENTION MESSAGES You will also see other important messages that are preceded by HONDA OWNER S MANUAL MANUEL DE L UTILISATEUR MANUAL DEL PROPIETARIO GX25 GX35 A WARNING The engine exhaust from this product contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm CONTENTS INTRODUCTION cece eee 1 SAFETY MESSAGEG 005 1 SAFETY INFORMATION 2 SAFETY INDICATION LOCATION ivccccccresaveotscevsrcnsnssenes 2 COMPONENT amp CONTROL LOCATION Soa cencestenceneerseesteveness 2 FEATURE Srini 3 BEFORE OPERATION CHECKS wesc icssvsticocesentnceves cannes isis 4 OPERATION cceceeseeseeeeeeeeees 4 SAFE OPERATING PRECAUTIONS hornii 4 STARTING THE ENGINE 4 SETTING ENGINE SPEED 5 STOPPING THE ENGINE 6 SERVICING YOUR
24. ease about 3 5 for each 300 meter 1 000 foot increase in altitude The effect of altitude on horsepower will be greater than this if no carburetor modification is made NOTICE When the carburetor has been modified for high altitude operation the air fuel mixture will be too lean for low altitude use Operation at altitudes below 1 500 meters 5 000 feet with a modified carburetor may cause the engine to overheat and result in serious engine damage For use at low altitudes have your servicing dealer return the carburetor to original factory specifications Oxygenated Fuels Some conventional gasolines are being blended with alcohol or an ether compound These gasolines are collectively referred to as oxygenated fuels To meet clean air standards some areas of the United States and Canada use oxygenated fuels to help reduce emissions If you use oxygenated fuel be sure it is unleaded and meets the minimum octane rating requirements Before using an oxygenated fuel try to confirm the fuel s contents Some states provinces require this information to be posted on the pump The following are the EPA approved percentages of oxygenates ETHANOL ethyl or grain alcohol 10 by volume You may use gasoline containing up to 10 ethanol by volume Gasoline containing ethanol may be marketed under the name Gasohol MTBE methyl tertiary butyl ether 15 by volume You may use gasoline containing up to 1
25. ed to the CLOSED position to start the engine gradually move it to the OPEN position as the engine warms up OPEN Hot Restart If the engine is operated at higher ambient temperatures then turned off and allowed to sit for a short time it may not restart on the first pull If necessary use the following procedure IMPORTANT SAFETY PRECAUTION Turn the engine switch to the OFF position before performing the following procedure This will prevent the engine from starting and running at maximum speed when the throttle is in the MAX speed position If the engine starts with the throttle in the MAX speed position the equipment can move forward rapidly or the trimmer attachment can spin at maximum speed This may result in personal injury e Tiller type 1 Turn the engine switch on the equipment to the OFF position 2 Move the choke lever to the OPEN position 3 Hold the throttle lever on the equipment in the MAX speed position 4 Pull the starter grip 3 to 5 times Follow the STARTING THE ENGINE procedure on page 4 and start the engine with the choke lever in the OPEN position e Pump type 1 Turn the engine switch to the OFF position 2 Move the choke lever to the OPEN position 3 Hold the throttle lever in the MAX speed position 4 Pull the starter grip 3 to 5 times Follow the STARTING THE ENGINE procedure on page 4 and start the engine with the choke lever in the OPEN position SETTING ENGINE SP
26. fuel in the fuel return tube 4 Tip the engine toward the fuel filler neck again to drain the fuel FUEL RETURN TUBE ENGINE OIL FILLER CAP PRIMING BULB FUEL FILLER NECK 5 After all fuel has drained reinstall the fuel filler cap securely Engine Oil 1 Change the engine oil see page 9 2 Loosen the 5 mm hex bolt then remove the top cover see page 11 3 Remove the spark plug see page 11 4 Apply a couple of drops of clean engine oil into the cylinder 5 Install the top cover temporarily 6 Pull the starter grip several times to distribute the oil in the cylinder 7 Remove the top cover then reinstall the spark plug 8 Install the top cover and tighten the 5 mm hex bolt securely see page 11 9 Pull the starter grip slowly until resistance is felt Storage Precautions If your engine will be stored with gasoline in the fuel tank and carburetor it is important to reduce the hazard of gasoline vapor ignition Select a well ventilated storage area away from any appliance that operates with a flame such as a furnace water heater or clothes dryer Also avoid any area with a spark producing electric motor or where power tools are operated If possible avoid storage areas with high humidity because that promotes rust and corrosion Keep the engine level in storage Tilting can cause fuel or oil leakage With the engine and exhaust system cool cover the engine to keep out dust A hot eng
27. gine A WARNING Improperly maintaining this engine or failure to correct a problem before operation can cause a malfunction in which you can be seriously hurt or killed Always perform a preoperation inspection before each operation and correct any problem Before beginning your preoperation checks be sure the engine is level and the engine switch is in the OFF position Always check the following items before you start the engine Check the General Condition of the Engine 1 Look around and underneath the engine for signs of oil or gasoline leaks 2 Remove any excessive dirt or debris especially around the muffler and recoil starter 3 Look for signs of damage 4 Check that all shields and covers are in place and all nuts bolts and screws are tightened Check the Engine 1 Check the fuel level see page 8 Starting with a full tank will help to eliminate or reduce operating interruptions for refueling 2 Check the engine oil level see page 9 Running the engine with a low oil level can cause engine damage 3 Check the air filter element see page 10 A dirty air filter element will restrict air flow to the carburetor reducing engine performance 4 Check the equipment powered by this engine Review the instructions provided with the equipment powered by this engine for any precautions and procedures that should be followed before engine startup OPERATION SAFE OPERATING PRECAUTI
28. h fresh gasoline p 8 3 Remove and inspect spark plug Spark plug faulty Gap or replace fouled or spark plug p 11 improperly gapped Spark plug wet Allow the spark with fuel plug to dry After flooded engine drying install the spark plug and start the engine p 4 4 Take engine to an authorized Honda servicing dealer or refer to shop manual Fuel filter restricted carburetor malfunction ignition malfunction valves stuck etc Replace or repair faulty components as necessary ENGINE LACKS POWER Possible Cause Correction 1 Check air filter Filter element restricted Clean or replace filter element p 10 2 Check fuel Bad fuel engine stored without treating or draining gasoline or refueled with bad gasoline Drain fuel tank and carburetor p 15 Refuel with fresh gasoline P 8 TECHNICAL amp CONSUMER INFORMATION TECHNICAL INFORMATION ENGINE TYPE Serial Number Location Record the engine serial number type and purchase date in the space below You will need this information when ordering parts and when making technical or warranty inquiries ENGINE SERIAL NUMBER Engine serial number Engine type Date Purchased _ Remote Control Linkage Standard Tiller type The throttle control lever is provided with a fitting for cable attachment Re
29. in 8 7 in Height 230 mm 236 mm 230 mm 9 1 in 9 3 in 9 1 in Dry weight 2 78 kg 2 96 kg 3 10 kg Without clutch 6 13 Ibs 6 53 Ibs 6 83 lbs Engine type 4 stroke overhead camshaft single cylinder Displacement Bore X Stroke 25 cm 1 5 cu in 35 X 26 mm 1 4 X 1 0 in emission control system See your Emission Control System Max output 0 81 kW 1 1 PS 1 1 bhp at 7 000 rom Warranty for additional information Max torque 1 25 N m 0 13 kgf m 0 92 Ibf ft at 5 000 rpm Descriptive Term Applicable to Emissions Durability Engine oil 0 08 2 0 08 US qt 0 07 Imp qt Period capacity Moderate 50 hours 0 65 cm 0 65 cc Fuel tank 0 55 2 0 145 US gal 0 121 Imp gal 125 hours greater than 65 cm 65 cc capacity 125 hours 0 65 cm 0 65 cc 250 hours greater than 65 cm 65 cc Intermediate Fuel consumption 340 g kWh 250 g PSh 0 55 Ib hph Cooling system Forced air Extended 300 hours 0 65 cm 0 65 cc Ignition system Transistorized magneto 500 hours greater than 65 cm 65 cc PTO shaft rotation Counterclockwise The Air Index Information hang tag label must remain on the GX35 Basic types engine until it is sold Remove the hang tag before operating the 3 T3 TR3 engine Type Standard Tiller Tiller Without tank guard Power equipment GCAST description code Length 198 mm 198 mm 198 mm 7 8 in 7 8 in 7 8 in
30. ine and exhaust system can ignite or melt some materials Do not use sheet plastic as a dust cover A nonporous cover will trap moisture around the engine promoting rust and corrosion Removal from Storage Check your engine as described in the BEFORE OPERATION CHECKS section of this manual see page 4 If the fuel was drained during storage preparation fill the tank with fresh gasoline If you keep a container of gasoline for refueling be sure it contains only fresh gasoline Gasoline oxidizes and deteriorates over time causing hard starting If the cylinder was coated with oil during storage preparation the engine will smoke briefly at startup This is normal TRANSPORTING If the engine has been running allow it to cool for at least 15 minutes before loading the engine powered equipment on the transport vehicle A hot engine and exhaust system can burn you and can ignite some materials ENGLISH 15 MD RS 05 12 16 15 02 48 32Z6J600_016 TAKING CARE OF UNEXPECTED PROBLEMS p ENGINE WILL Possible Cause Correction NOT START 1 Check control Choke open Move lever to positions CLOSED position unless the engine is warm Engine switch Turn engine switch OFF on the to ON position equipment 2 Check fuel Out of fuel Refuel p 8 Bad fuel engine stored without treating or draining gasoline or refueled with bad gasoline Drain fuel tank and carburetor p 15 Refuel wit
31. isfied with the decision made by the dealership s management contact the Honda Regional Engine Distributor for your area If you are still dissatisfied after speaking with the Regional Engine Distributor you may contact the Honda Office as shown All Other Areas If you are dissatisfied with the decision made by the dealership s management contact the Honda Office as shown Honda s Office When you write or call please provide this information e Equipment manufacturer s name and model number that the engine is mounted on e Engine model serial number and type see page 16 e Name of dealer who sold the engine to you e Name address and contact person of the dealer who services your engine e Date of purchase e Your name address and telephone number e A detailed description of the problem United States Puerto Rico and U S Virgin Islands American Honda Motor Co Inc Power Equipment Division Customer Relations Office 4900 Marconi Drive Alpharetta GA 30005 8847 Or telephone 770 497 6400 8 30 am 8 00 pm EST Canada Honda Canada Inc 715 Milner Avenue Toronto ON M1B 2K8 Telephone 888 JHONDAY 888 946 6329 English 416 299 3400 French 416 287 4776 Facsimile 877 939 0909 416 287 4776 For European Area Honda Europe NV European Engine Center Toll free Local Toronto dialing area Local Toronto dialing area Toll free Local Toronto dialing area http www honda
32. move the air cleaner cover see page 10 for access to the throttle lever and cable fitting Attach the throttle cable as shown in the illustration To adjust the throttle cable follow the equipment manufacturer s instructions CABLE ATTACHMENT FITTING 3 Take engine to Fuel filter Replace or repair an authorized restricted faulty components Honda carburetor as necessary LOCK NUT servicing malfunction dealer or refer ignition to shop malfunction manual valves stuck etc THROTTLE CABLE ADJUST NUT 16 ENGLISH T T D 05 12 16 15 03 11 32Z6J600_017 Carburetor Modifications for High Altitude Operation At high altitude the standard carburetor air fuel mixture will be too rich Performance will decrease and fuel consumption will increase A very rich mixture will also foul the spark plug and cause hard starting Operation at an altitude that differs from that at which this engine was certified for extended periods of time may increase emissions High altitude performance can be improved by specific modifications to the carburetor If you always operate your engine at altitudes above 1 500 meters 5 000 feet have your servicing dealer perform this carburetor modification This engine when operated at high altitude with the carburetor modifications for high altitude use will meet each emission standard throughout its useful life Even with carburetor modification engine horsepower will decr
33. park arrester in the reverse order of disassembly When you install the spark arrester the spark arrester s outlet must point to the side opposite the spark plug 3 Install the top cover and tighten the 5 mm hex bolt securely see page 11 ENGLISH 13 Zon p 05 12 16 15 02 07 32Z6J600_014 Tiller type Spark Arrester Removal 1 Loosen the 5 mm hex bolt then remove the top cover see page 11 2 Remove the 4 X 6 mm self tapping screws from the spark arrester and remove the spark arrester from the muffler MUFFLER SPARK PLUG SPARK ARRESTER 4 X 6mm SELF TAPPING SCREWS Spark Arrester Cleaning amp Inspection 1 Use a brush to remove carbon deposits from the spark arrester screen Be careful to avoid damaging the screen The spark arrester must be free of breaks and holes Replace the spark arrester if it is damaged SPARK ARRESTER SCREEN Sy 2 Install the exhaust filter and spark arrester in the reverse order of disassembly When you install the spark arrester the spark arrester s outlet must point to the side opposite the spark plug 3 Install the top cover and tighten the 5 mm hex bolt securely see pagel HELPFUL TIPS amp SUGGESTIONS STORING YOUR ENGINE Storage Preparation Proper storage preparation is essential for keeping your engine trouble free and looking good The following steps will help to keep rust and corrosion from impairing your engine s func
34. ssumes the responsibility that the part will not adversely affect emission performance The manufacturer or rebuilder of the part must certify that use of the part will not result in a failure of the engine to comply with emission regulations ENGLISH 17 HD AA as PS D 05 12 19 14 40 01 32Z6J600_018 Maintenance Follow the maintenance schedule on page 7 Remember that this schedule is based on the assumption that your machine will be used for its designed purpose Sustained high load or high temperature operation or use in unusually wet or dusty conditions will require more frequent service Air Index An Air Index Information hang tag label is applied to engines certified to an emission durability time period in accordance with the requirements of the California Air Resources Board The bar graph is intended to provide you our customer the ability to compare the emissions performance of available engines The lower the Air Index the less pollution The durability description is intended to provide you with information relating the engine s emission durability period The descriptive term indicates the useful life period for the engine s Specifications GX25 Basic types 3 T3 W3 Type Standard Tiller Pump Without tank guard Power equipment GCART description code Length 192 mm 192 mm 247 mm 7 6 in 7 6 in 9 7 in Width 221 mm 210 mm 221mm 8 7 in 8 3
35. storage preparation are not covered under the Distributor s Limited Warranty You can extend fuel storage life by adding a gasoline stabilizer that is formulated for that purpose or you can avoid fuel deterioration problems by draining the fuel tank and carburetor Adding a Gasoline Stabilizer to Extend Fuel Storage Life When adding a gasoline stabilizer fill the fuel tank with fresh gasoline If only partially filled air in the tank will promote fuel deterioration during storage If you keep a container of gasoline for refueling be sure that it contains only fresh gasoline 1 Add gasoline stabilizer following the manufacturer s instructions 2 After adding a gasoline stabilizer run the engine outdoors for 10 minutes to be sure that treated gasoline has replaced the untreated gasoline in the carburetor 3 Stop the engine 14 ENGLISH HD 05 12 16 15 02 29 32Z6J600_015 Draining the Fuel Tank and Carburetor A WARNING Gasoline is highly flammable and explosive and you can be burned or seriously injured when handling fuel e Stop engine and keep heat sparks and flame away e Handle fuel only outdoors e Wipe up spills immediately 1 Make sure the engine oil filler cap is tightened securely 2 Remove the fuel filler cap and drain the fuel into an approved gasoline container by tipping the engine toward the fuel filler neck 3 Press the priming bulb several times until there is no more
36. ten securely NOTICE Running the engine with a low oil level can cause engine damage Oil Change Drain the used oil when the engine is warm Warm oil drains quickly and completely 1 Check that the fuel filler cap is tightened securely 2 Place a suitable container below the engine to catch the used oil 3 Remove the oil filler cap dipstick and drain the oil into the container by tipping the engine toward the oil filler neck Please dispose of used motor oil in a manner that is compatible with the environment We suggest you take used oil in a sealed container to your local recycling center or service station for reclamation Do not throw it in the trash pour it on the ground or down a drain FUEL FILLER CAP OIL FILLER NECK 4 With the engine in a level position fill to the bottom edge of the oil fill hole with the recommended oil see page 8 Some oil will remain in the engine after draining When refilling with fresh oil start with less than 80 cm 2 7 US oz 2 8 Imp 02 Slowly add enough oil to fill to the bottom edge of the oil fill hole as shown below NOTICE Running the engine with a low or excessive oil level can cause engine damage OIL FILLER CAP DIPSTICK OIL FILL HOLE bottom edge UPPER LIMIT UPPER LIMIT 5 Reinstall the oil filler cap dipstick securely If any oil is spilled make sure to wipe it up ENGLISH 9 HD p 05 12 16 15 00 48 3
37. tion and appearance and will make the engine easier to start when you use it again Cleaning If the engine has been running allow it to cool for at least half an hour before cleaning Clean all exterior surfaces touch up any damaged paint and coat other areas that may rust with a light film of oil NOTICE Using a garden hose or pressure washing equipment can force water into the air cleaner or muffler opening Water in the air cleaner will soak the air filter and water that passes through the air filter or muffler can enter the cylinder causing damage Fuel Gasoline will oxidize and deteriorate in storage Deteriorated gasoline will cause hard starting and it leaves gum deposits that clog the fuel system If the gasoline in your engine deteriorates during storage you may need to have the carburetor and other fuel system components serviced or replaced The length of time that gasoline can be left in your fuel tank and carburetor without causing functional problems will vary with such factors as gasoline blend your storage temperatures and whether the fuel tank is partially or completely filled The air ina partially filled fuel tank promotes fuel deterioration Very warm storage temperatures accelerate fuel deterioration Fuel problems may occur within a few months or even less if the gasoline was not fresh when you filled the fuel tank Fuel system damage or engine performance problems resulting from neglected
38. with persistent spark knock or pinging is considered misuse and the Distributor s Limited Warranty does not cover parts damaged by misuse 1 Check the fuel level by looking through the translucent fuel tank 2 If the fuel level is low refuel in a well ventilated area with the engine stopped If the engine has been running allow it to cool Standard Pump type Tiller type FUEL FILLER CAP MAXIMUM FUEL LEVEL Fy To refuel rest the engine on the ground with the fuel filler cap facing up as shown Remove the fuel filler cap and fill the tank with gasoline to the bottom of the filler neck Refuel carefully to avoid spilling fuel Do not overfill There should be no fuel in the filler neck After refueling tighten the fuel filler cap securely Never refuel the engine inside a building where gasoline fumes may reach flames or sparks Keep gasoline away from appliance pilot lights barbecues electric appliances power tools etc Spilled fuel is not only a fire hazard it causes environmental damage Wipe up spills immediately For information regarding oxygenated fuels please refer to page 17 ENGINE OIL Oil is a major factor affecting performance and service life Use 4 stroke automotive detergent oil Recommended Oil SAE Viscosity Grades Use 4 stroke motor oil that meets or exceeds the requirements for API service classification
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