OPERATING INSTRUCTIONS
Contents
1. TROUBLESHOOTING GUIDE This troubleshooting guide has been provided to help you diagnose and solve most problems that you may encounter with your Magnum XL 25ARNV XL 28ARNV engine Most problems encountered can be solved by carefully following the problem cause solution sections below If you cannot solve the problem using this troubleshooting guide please feel free to contact us at the address or phone number listed Magnum Engines Customer Care 18480 Bandilier Circle Fountain Valley CA 92728 Phone 714 963 0329 Fax 714 964 6236 E mail service globalhobby com PROBLEM CAUSE SOLUTION 1 Engine does not start A Failed glow plug B Glow Starter not charged and or faulty C Engine not being turned over fast enough D Idle mixture screw set too lean E Old or contaminated fuel F Engine flooded with too much fuel G Faulty fuel tank and or stopper assembly H Air leak in fuel system and or engine A Replace glow plug with a new one B Fully charge glow starter and or replace C Use an electric starter to start engine D Reset idle mixture to factory setting E Replace with new fuel F Remove glow plug and expel fuel from cylinder G Check and or replace fuel tank assembly H Replace fuel lines and or tighten all engine bolts 2 Engine does not draw fuel A Air leak in fuel system and or engine B High Speed Needle Valve fully closed C Idle mixture screw set too lean2. This way the muffler fuel tank and throttle linkage can all be tested in combination with the engine If your airplane uses a cowling it should be removed during the break in procedure 1 Turn the high speed needle valve out 2 1 2 turns from the fully closed position 2 Ifyou are using an electric starter to start the engine follow the procedure in the previous section If you are starting the engine by hand follow that procedure in the previous section 3 Open the throttle barrel to approximately 1 4 throttle Connect the power to the glow plug Start the engine using an electric starter or by hand If starting by hand you will need to vigorously flip the propeller through the compression stroke several times before the engine will start 4 Once the engine starts open the throttle barrel to about 1 2 throttle You may need to lean the high speed needle valve in about 1 4 turn to keep the engine running at half throttle 5 After the engine has been running about 1 minute remove the power from the glow plug Advance the throttle barrel to full throttle Adjust the high speed needle valve so that the engine is running very rich You should notice excessive white smoke coming from the exhaust Let the engine run for approximately 10 minutes then stop the engine 6 Let the engine cool for approximately 10 minutes then restart it Set the high speed needle valve mixture to a slightly leaner setting about 1 4 turn m
3. XL 36ARNV Shown INTRODUCTION The Magnum XL 25ARNV thru 36ARNV engines are single cylinder two cycle engines incorporating ABC piston and sleeve technology for long life and easy break in A dual needle carburetor for precise adjustments is standard on all four engines All four engines incorporate a cast aluminum rear needle valve assembly for safety The engine was designed by expert engineers and built by master craftsmen using only the highest quality ma terials and CNC machinery These qualities provide the long life and de pendability you have come to expect from an engine of this caliber BECOMING FAMILIAR WITH THE MAGNUM XL 25ARNV thru 36ARNV ENGINES Before attempting to operate your new engine please read through this instruction sheet in it s entirety This will help you familiarize yourself with the features and operation of your new engine Use the photos below to identify the major component parts of your new engine Pressure Nipple Muffler Muffler Thru Bolt _ Exhaust Cone Cylinder Head Needle Valve Carburetor ___ Detent Spring Throttle Arm Prop ma Prop Nut Crankshaft Needle Valve Mount Fuel Nipple Crankcase Bolt Idle Mixture Idle Stop Screw Nipple Nipple Idle Mixture Screw inside throttle arm Throttle XL 36ARNV Shown Arm XL 28ARNV Shown OPERATING INSTRUCTIONS XL 25ARNV 28ARNV and XL 32ARNV 36
4. barrel completely placing your finger over the carburetor opening and flipping the prop through compression 2 3 times If you will be using an electric starter do not prime the engine The starter will turn the engine over fast enough to draw fuel on it s own 3 Connect the glow starter to the glow plug Open the carburetor barrel to about 1 4 throttle and start the engine If you are starting the engine by hand you will need to vigorously flip the prop several times before the engine will start Once the engine begins running immedi ately turn the high speed needle valve in to keep the engine running 4 Advance the throttle to full while turning the high speed needle valve in to keep the engine running The engine should be producing a very noticeable white exhaust from the muffler and sound like it is run ning rough Allow the engine to run only for about 5 minutes then shut the engine off 5 Now that you have started your new engine it must be properly broken in Proper break in will seat all of the moving parts particularly the piston and sleeve This procedure takes about 30 minutes of run time and is highly recommended An engine that is properly broken in will produce more power be more user friendly and last much longer than an engine that does not receive a break in period For this reason we highly recommend following the break in procedure detailed in the Operating Instructions before you run the engine further
5. from the glow plug Al low the engine to warm up for about 1 minute 2 After the engine has warmed up slowly lean the high speed mix ture until the engine reaches peak R P M After reaching peak R P M richen the mixture slightly until an audible drop in R P M is heard If you are using a tachometer this should be between a 200 300 R P M drop O 3 With the engine running at full power carefully lift the nose of the airplane about 45 into the air The mixture should not become too lean but you may hear a slight increase in R P M If the engine sags or loses R P M when you hold the nose up the mixture is too lean Note R P M will increase about 10 30 in the air This is due to the forward motion of the aircraft as it is flying Because of this more air is entering the carburetor at a higher force and causes the mixture to lean out Additionally as the fuel level in the fuel tank goes down fuel draw becomes more difficult for the engine especially during aerobatics thus causing the mixture to go lean It is imperative that you set the mixture rich while on the ground to compensate for the leaning tendencies that will happen in the air Always watch the exhaust during your flight The en gine should leave a noticeable white smoke trail at all times It there is no smoke trail the engine is running too lean You should land immediately and reset the mixture All Magnum engines returned for warranty service must
6. needle valve B Open larger vents in cowling to allow air to exit C Use fuel with recommended oil content D Allow engine further break in time 7 Engine stops abruptly A Engine running too lean B Piston and sleeve fit worn A Richen high speed needle valve B Return engine to Magnum Engines Service Center MAGNUM XL 25SARNV PARTS BREAK 32814 12812 A coe 612 SS nee amp 28119 25101 _ 28109 MAGNUM To order replacement parts visit your nearest Magnum Engines dealer or call the Magnum Service Center direct at 1 714 963 0329 XL 25ARNV Parts are listed here in numerical order PARTS LIST QUANTITY PART DESCRIPTION 12114 Pressure Nipple 12811 Idle Mixture Screw Housing 12812 Throttle Arm 12819 Fuel Nipple w Gasket 12833 Detent Spring 12845 Idle Mixture Screw O Ring 12847 Gasket 25101X Crankcase 25103 Cylinder Head 25112 Cylinder Head Gasket Set 25203 Piston and Sleeve Set 25801F Carburetor Assembly Complete 25803F Carburetor and Rear Needle Valve Assembly Complete 25863 Carburetor Body w Spray Bar 25874F Rear Needle Valve Assembly Complete 28102 Backplate 28109 Front Bearing 28110 Rear Bearing 28111 Backplate Gasket 28119 Carburetor Retaining Bolt 2 28120 Muffler Bolt Set 28123 Cylinder Head Bolt Set 28134 Backplate Bolt Set 28204 Wrist Pin 28210 Crankshaft 28213 Wrist Pin Assembly 28238 Drive Washer and Collet 28601
7. ARNV SPECIFICATIONS XL 25 XL 28 XL 32 XL 36 Displacement cc 4 05 4 57 5 26 5 81 Bore mm 17 42 18 5 19 5 20 5 Stroke mm 8 5 8 5 8 8 8 8 Practical R P M 2 000 16 000 2 000 16 000 2 000 16 000 2 000 16 000 Weight w Muffler 11 2 10 8 12 3 12 Crankshaft Thread 1 4 28 1 4 28 1 4 28 1 4 28 WARNING Magnum model engines will consistently give you dependable performance and reliability and will be a source of satisfaction and pleasure if you fol low these instructions as to the engine s proper and safe use You alone are responsible for the safe operation of your engine so act sensibly and with care at all times This Magnum model engine is not a toy It is a precision built machine whose power is capable of causing serious injury to yourself and others if abused misused or if you fail to observe proper safety pre cautions while using it Please read the safety warnings below carefully amp Keep spectators especially small children at least 20 feet away from the engine while it is running amp Mount the engine securely in the airplane a suitable engine test stand to run the engine Follow the mounting instructions in your kits in struction manual or on the plans for individual mounting recommendations Do not clamp the engine in a vise to test run it amp Use the recommended size propeller and follow the proper procedure f
8. D Fuel lines kinked E Defective fuel tank A Replace fuel lines and or tighten all engine bolts B Reset high speed needle valve to factory setting C Reset idle mixture to factory setting D Check and straighten fuel lines E Replace fuel tank 3 Engine vibrates excessively A Propeller out of balance B Engine and or motor mount loose A Balance propeller B Tighten motor mounting bolts 4 Engine does not transition A Failed and or wrong type glow plug B Old and or wrong type fuel C High speed needle valve set too rich D Idle mixture set too lean E Idle mixture set too rich F Air leak in fuel system and or engine G Propeller too large A Replace with new recommended glow plug B Replace with new recommended fuel C Reset high speed needle valve to leaner setting D Set idle mixture richer E Set idle mixture leaner F Replace fuel lines and or tighten all engine bolts G Replace with one size smaller propeller 5 Throttle barrel does not close completely A Throttle servo linkage out of adjustment B Idle stop screw out of adjustment C Idle mixture screw set too lean A Adjust throttle linkage to close throttle barrel completely B Turn idle stop screw out until barrel closes C Readjust idle mixture screw to factory setting 6 Engine Overheats A Engine running too lean B Cowl too restrictive C Wrong type of fuel used D Engine not fully broken in A Richen high speed
9. Muffler Assembly Complete 28616 Muffler Axial Bolt 28810 Idle Mixture Screw w O Ring 32609 Muffler Gasket Set 2 32814 Carburetor Barrel Spring 32832 Idle Stop Screw Set 32837 Rotor Bolt Set 40123 Rear Needle Valve Bolt Set 40228 Prop Washer and Nut 40816 Carburetor O Ring 46845F High Speed Needle Valve O Ring 46861F High Speed Needle Valve Only w O Ring 91137 Needle Valve Mount Gasket 32868F Carburetor Plug 1 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
10. able to properly balance propellers Ask your local retailer for more information about these items Using a 1 4 drill bit or a prop reamer drill out the hole in the pro peller hub to fit the crankshaft The crankshaft is 1 4 in diameter Slide the propeller onto the crank shaft up against the thrust washer Slide the propeller washer up against the propeller Thread the prop nut onto the crankshaft Com pletely tighten the prop nut to secure the propeller in place When tighten ing the prop nut use the proper size open end wrench Do not use pliers Note If you are installing a spinner onto your engine the cone of the spinner must not rub against the propeller If the spinner cone rubs against the propeller this could lead to propeller damage and eventual propeller failure PROPELLER FUEL amp GLOW PLUG Propeller Recommendation The diameter and pitch of the propeller needed for the XL 25ARNV thru 36ARNV will vary greatly depending on the application the engine is used in The weight drag and the type of model and how you intend to fly it are all factors in determining the correct size propeller to use Experimenta tion will be necessary to find the optimal size propeller for your particular application Ideally you want a propeller that the engine will turn in the 10 000 14 000 R P M range yet power the airplane sufficiently Using a propeller that is too small will cause the engine to run at too hig
11. be within the war ranty terms as stated on the warranty card provided with your engine Do not return the engine to the place of purchase They are not authorized or equipped to perform warranty work on Magnum products When request ing warranty service please observe the following Always send the complete engine including the carburetor and muf fler The engine must be removed from the model Include a note detailing the problem or service you are requesting Service cannot be provided without this information Include your day time phone number or e mail address in the event we need more details pertaining to the service requested You may request an estimate of services at the time you return your engine for service An omission of this request implies permission for the Magnum Service Center to service your engine at our discretion Include a method of payment for any service charges If not speci fied the unit will be returned to you C O D Please include a check or money order in the amount of 6 50 to cover postage and handling charges for the return of your engine Do not send cash Send the engine to us by United Parcel Service Federal Express or by Insured Mail Postage in not refundable Send to Magnum Service Center 18480 Bandilier Circle Fountain Valley CA 92728 Phone 714 963 0329 Fax 714 964 6236 e mail service globalhobby com All Contents 2000 Global Hobby Distributors Version V 1 0 Janua
12. edle valve use a 1 5mm diameter wire of the necessary length Loosen the set screw in the side of the needle valve insert the wire into the end of the needle valve and tighten the set screw firmly If the extension is more than 3 long we recommend supporting the outer end of the extension to prevent excessive vibration Idle Stop Screw and Rotor Bolt The rotor bolt holds the throttle barrel into the carburetor body on all four of these engines These bolts typically do not require any adjustment On the 25ARNV and the 28ARNV the idle stop screw adjusts the closure of the throttle barrel We recommend that the throttle barrel be allowed to close completely so the engine can be shut off using your radio transmit ter Turning the screw clockwise will cause the barrel to stay open more Turning the screw counterclockwise will allow the barrel to close more Do not turn the screw any further out than necessary to allow the throttle barrel to fully close The 32ARNV and 36ARNV does not utilize an idle stop screw Barrel closure is controlled completely by the transmitter Propeller Installation Note Before installing any propeller it must be properly balanced Running an engine using an improperly balanced propeller can lead to ex cessive vibration which can cause excessive stress and wear on both the engine and the airframe Balance the propeller using the recommended method of the propeller manufacturer Several products are avail
13. edle valve or just slightly below the high speed needle valve Most models will only allow the fuel tank to be mounted higher than the ideal location A fuel tank that is positioned higher than the ideal location usu ally doesn t pose any problem except when it is mounted excessively higher and or used in conjunction with an inverted mounted engine or during ex treme aerobatic flight If mounting your engine inverted it is advised to lower the fuel tank so the stopper is slightly below the high speed needle valve Doing this will prevent fuel from siphoning into the engine and flooding it when the fuel tank is full If you cannot lower the fuel tank far enough we suggest lowering it as far as can be allowed in your particular application The size of the fuel tank used for the 25 or 28 should be 60z 807 depending on the model and the length of flights desired Use of an 807 tank will provide about 15 minutes of run time at full throttle Use of a fuel tank any larger than 807 can lead to excessive leaning of the engine mix ture during flight and is not recommended The Size of the tank used for the 32 36 should be 807 1007 Use of a 1007 tank will provide about 20 minutes of run time at full throttle Use of a tank any larger than 1007 can lead to excessive leaning of the engine mixture during flight and is not recommended Carburetor Installation The carburetor is held in place using two machine screws Slide the base of
14. el completely While holding the barrel open for the XL 25ARNV and 28ARNV turn the mixture screw in until it stops From this point turn the mixture screw out 3 turns For the XL 32ARNV 36 turn the mixture screw out until it stops From this point turn the mixture screw in 3 turns These are the factory settings for each engine These adjustments should be made with the carburetor barrel held firmly open STARTING PROCEDURE The XL 25ARNV thru 36ARWV can be started using an electric starter or they can be started by hand For safety and ease of starting especially when the engine is new we recommend using an electric starter The fol lowing two procedures should be done with the power to the glow plug off Starting with an Electric Starter When using an electric starter it is not necessary to prime the engine The starter turns the engine over fast enough that the engine draws fuel on it s own Priming the engine prior to using an electric starter can cause the engine to hydro lock or flood This is a result of too much fuel in the engine before it actually fires Turning the engine over with an electric starter while the engine is flooded can cause extreme damage to the engine and or cause your propeller assembly to come loose Turn the propeller through the compression stroke one time by hand to check for a hydro locked state before applying the starter Starting by Hand When starting
15. glow plug It uses a Sub C Nicad includes a meter to determine the quality of your glow plug and it also includes a charger to recharge the battery It s a very economical product to purchase and can be used with any engine that uses a glow plug Motor Mount Hayes Motor Mount AL 25 011 The Hayes motor mount is a glass filled type that mounts to a ply wood firewall in the model It is easy to install and rugged yet in the event of a crash will break away to minimize damage to the engine and or airframe Engine Preparation 1 Mount the engine to the recommended motor mount A wood beam mount built into the airframe would also be sufficient 2 Install the muffler to the engine using the two machine screws and washers provided Use one of the muffler gaskets provided The back portion of the muffler can be rotated to better suit the installation in your model Be sure to tighten the retaining nut securely to prevent the muffler from loosening 3 Using a 1 4 drill bit drill out the center hub in the propeller Install the propeller to the engine using the washer and propeller nut pro vided Tighten the propeller nut securely using an adjustable wrench Engine Starting 1 Carefully turn the high speed needle valve in completely until it stops then turn the needle valve out 2 1 2 turns This is the mixture setting for initial starting 2 Ifhand starting prime the engine by opening the throttle
16. h an R P M Using a propeller that is too large will cause the engine run at too low an R P M and cause it to lug down too much In both instances this can lead to premature engine wear and eventual failure Propeller Size Recommendations XL 25ARNV XL 28ARNV XL 32ARNV XL 36ARNV Glow Plug Recommendation Glow plugs can also make a big difference on the performance of your engine For the XL 25ARNV thru the 36ARNV we recommend using a hot heat range glow plug intended specifically for two cycle engines Do not use a cold heat range plug This can lead to erratic engine runs and eventual engine wear and failure Fuel Recommendation Fuel can make a big difference in the way your engine performs We rec ommend using two types of fuel with the XL 25ARNV thru 36ARNV engines For the break in period you must use a fuel containing no more than 10 nitro methane and no less than 20 Castor Oil lubricant Use of fuel containing more than the recommended percentage of nitro methane or any synthetic lubricants will cause the engine to run too hot and result in excessive wear and engine failure in a very short period of time Once the engine has been adequately broken in about 1 2 gallon of the recommended break in fuel a fuel containing up to but no more than 15 nitro methane and no less than 16 Castor Oil and synthetic lubricant blended fuel can be used Note We do not recommend using fuels that conta
17. in only synthetic lubricants Synthetic lubricants have a much lower flash point than Cas tor Oil lubricants Flash point is the point at which the lubricant begins to actually burn and loses it s lubricating qualities Using fuels containing a blend of Castor Oil and synthetic lubricants results in an engine that runs cooler and lasts longer One lean run using a fuel containing only syn thetic lubricants can cause engine failure Using fuels with a Castor Oil and synthetic blend of lubricants greatly reduces this chance HIGH amp LOW SPEED NEEDLE VALVES High Speed Needle Valve The high speed needle valve is used to meter the air fuel mixture at full throttle Turn the needle clockwise to lean the mixture or turn the needle counterclockwise to richen the mixture When you start the engine for the very first time the needle valve should be turned in completely then backed out 2 1 2 turns When you start the engine after that leave the needle valve in the same position it was in when you shut down the engine Low Speed Needle Valve The low speed needle valve regulates the air fuel mixture at idle and dur ing transition from idle to full throttle Turn the idle mixture screw clock wise to lean the mixture Turn it counterclockwise to richen the mixture The idle mixture screw is preset from the factory but minor adjustments may need to be made To reset the mixture screw to the factory setting open the carburetor barr
18. methane methanol Castor Oil and synthetic lubricants to provide high power output along with easy starting and unmatched lubricating and heat dissipation qualities For the extra lubrication necessary for break in use 10 2 stroke blend After break in for extra performance use 15 2 stroke blend Fuel Tank Hayes Fuel Tank 071 The Hayes fuel tank is a perfect match for the 25 and 28 It is large enough to give you about 15 20 minutes of run time at full throttle and is possibly the easiest fuel tank to assemble and maintain Glow Plug Thunderbolt R C Long 115493 The Thunderbolt R C Long glow plug is designed to be used in two stroke engines using fuels containing 10 20 nitro content and in any envi ronment It is a hot type of glow plug for easy starting excellent transi tion and incredible top end The plug is also very durable and able to withstand repeated use day after day Propeller APC 9 x 5 Propeller LP09050 We have found that the engines run at there best using APC brand props They are designed to be very efficient run quiet at high R P M s and are also durable Use this size prop to break in your engine then change to the prop that best suits your application Use the guide in the Operating Instructions to help you find the right size propeller Glow Driver Magnum Glow Starter w Meter 237438 The Magnum glow starter is an excellent choice for heating the
19. or mounting the propeller Use the correct size wrench to tighten the propeller nuts Do not use pliers amp Inspect the spinner propeller and propeller nut on a regular basis looking for any signs of nicks cracks or loosening amp stop the engine adjust the throttle linkage to completely close the throttle barrel and therefore cut off the air supply You can also pinch the fuel line to stop the engine but only if it is safely accessible Do not throw anything into the spinning propeller or attempt to use your hands to stop the engine amp Stand behind the engine while it is running to make any adjustments to the mixture controls Do not reach over or around the propeller Do not lean towards the engine Do not wear loose clothing or allow anything to be drawn into the spinning propeller while the engine is running 3 If you need to carry your model while the engine is running be con scious of the spinning propeller Keep the airplane pointed away from you and others at all times while the engine is running 3 not use tight fitting cowls or oversized spinners as these can im pede airflow over the engine and result in overheating and possible severe damage to the engine INSTALLATION Engine Orientation The Magnum XL 25ARNV 36ARNV engines can be orientated in any posi tion on the firewall Keep in mind that when the engine is mounted inverted carburetor adjustments will need to made differently and the f
20. ore in Let the engine run for about 5 minutes at this setting then stop the engine and let it cool for approximately 10 minutes 7 Repeat the procedure in step 6 while leaning the needle valve slightly more each time In all you should run the engine about a total of 30 minutes of actual running time After 30 minutes of run time the engine is ready for flight Fly the airplane with the engine set as rich as possible but with adequate power to fly the airplane After each flight lean the mixture slightly Continue to do this for about 5 flights At this point the engine should hold a good setting on the high speed needle valve and you can begin to fine tune the needle valve settings to increase performance Setting the Low Speed Needle Valve 1 Start the engine and lean out the high speed needle valve as the previous steps Close the throttle until the slowest reliable idle is reached Allow the engine to idle for about 30 seconds 2 Quickly advance the throttle to full If the engine just stops run ning as soon as the throttle is advanced the idle mixture is too lean With the engine stopped richen the idle mixture about 1 8 of a turn 3 Repeat steps 1 and 2 until the engine will transition from idle to full throttle smoothly Minor hesitation in the transition will be normal 4 If you quickly advance the throttle from idle to full and the en gine seems to be very rich during transition i e lo
21. ry 2000 MAGNUM XL 25ARNV and XL 28ARNV QUICK START and TROUBLESHOOTING GUIDE The following information is provided to get your new Magnum XL 25ARWNV XL 28 running right away with minimal effort We have listed our recommendations for fuel propeller starting procedures and other recommended accessories Also included is general information about the accessories needed for the Magnum XL 25ARNV and XL 28ARNV engines that we hope you will find helpful This Quick Start Guide should not be used as a replacement to the Operating Instructions included rather it should be used along with the Operating Instructions We highly recommend reading through the Operating Instructions to familiarize yourself with each part of your particular engine along with the proper procedures for engine break in tuning care and maintenance OUR RECOMMENDATIONS QUICK STARTING The following items are recommended for use with both the XL 25ARNV XL 28 ARNV engines These items are recommended for initial start up and running Please read through the Operating Instructions for further details Fuel Power Master 10 2 Stroke Blend 275180 for break in and normal operation We suggest using Power Master brand fuels Power Master fuel comes in 10 and 15 nitromethane contents that can be used in both the Magnum XL 25ARNV and XL 28ARNV engines Power Master fuels are blended using only high quality nitro
22. the carburetor into the crankcase being careful to keep the carbure tor perpendicular to the front of the engine With your thumb push down on the carburetor firmly so the base of the carburetor sets com pletely into the crankcase and the carburetor o ring seals the gap be tween the crankcase and carbure tor While holding the carburetor in place thread one machine screw into each side of the carburetor Use a screwdriver to carefully tighten both screws securely There is no need to overtighten the screws Note Do not overtighten the retaining screws The screws only need to be tightened enough to keep the carburetor from moving in the crankcase Overtightening the screws can cause severe damage to the base of the carburetor Rear Needle Valve Installation The rear needle valve assembly is held in place using the two socket cap screws and two split washers pro vided with the assembly To mount the assembly remove the two up per backplate screws set the as sembly in place then install the two screws and split washers provided with the assembly Tighten the screws completely Install the pro vided length of silicon fuel line between the needle valve assembly and the carburetor The fuel pickup line from your fuel tank will connect to the larger brass nipple on the needle valve assembly Socket Cap Screws Mounting Bracket Needle Valve Extension If an extension is required to adjust the high speed ne
23. the engine by hand always use a chicken stick Never just use your hand or serious injury could result To make the engine easier to start by hand it should be primed This is done by opening the carburetor com pletely and choking the engine by putting your finger over the carburetor opening With the carburetor choked pull the propeller through the com pression stroke 2 3 times This will draw fuel into the engine Remove your finger and pull the propeller through the compression stroke once to check for a hydro locked condition BREAK IN PROCEDURE Note The XL 25ARNV thru 36ARNV ABC engines The cylin der sleeve is tapered at the top causing severe resistance when the piston moves through the top of the stroke This is normal When the engine heats up to operating temperature this resistance will decrease and the proper clearance will be achieved The break in procedure will guide you through the steps necessary to properly break in your new ABC engine Please follow the steps closely The break in process allows the engine parts to perfectly fit to each other and properly protect each part from premature wear The engine should be broken in using fuel that contains no more than 10 nitro methane and no less than 20 Castor Oil lubricant Synthetic lubricant fuels should not be used during the break in procedure For the break in procedure we recommend mounting the engine into the airplane it will be used in
24. ts of smoke coming from the exhaust the mixture is too rich With the engine stopped lean the idle mixture about 1 8 of a turn 5 Repeat steps 1 and 4 until the engine will transition from idle to full throttle smoothly Minor hesitation in the transition will be normal MAINTENANCE Avoid running the engine under dusty conditions If you are in dusty environment we suggest using an air filter over the carburetor Atthe end of every flying day purge the engine of fuel by disconnect ing the fuel line and allowing the engine to run dry of fuel Use a high quality after run oil in the engine after you have purged the engine of fuel Inject the oil into the engine through the carburetor and through the glow plug hole Wipe the outside of the engine dry using a soft cloth Use a fuel filter between the fuel tank and the carburetor SETTING THE MIXTURE SERVICE Now that your engine is broken in you can set the high and low speed needle valves for optimum performance Note Be careful to never lean the engine out too much Remember that the lubricants for your engine are suspended in the fuel If you lean out the fuel mixture too much you will also be lowering the amount of lubricant entering your engine Less lubricant means more chance of your engine overheating and possible engine failure Setting the High Speed Needle Valve 1 Start the engine and remove the power
25. uel tank may need to be lowered See tank size and orientation to carburetor on next page Engine Bolts and Firewall Requirements The engine should be mounted to a glass filled nylon mount or an inte grated hardwood beam mount Use only high quality steel cap screws and related hardware to mount the engine to the motor mount The firewall in the airplane should be aircraft grade 5 ply plywood and be no less than 1 4 thick The firewall should also be reinforced to meet the torque and weight of the engine Muffler Installation The muffler is mounted to the engine using the two socket cap screws two split washers and one of the two gaskets provided The second gasket should be kept as a spare Tighten both screws securely to prevent the muffler from loosening during flight The exhaust cone on the rear half of the muffler is adjustable to better match the installation of your particular application To adjust the cone loosen the retaining nut us ing asmall wrench Rotate the cone to the desired angle then tighten the retaining nut completely while hold ing the thru bolt in place from the front of the muffler using a flat blade screwdriver It is important to tighten the retaining nut completely to pre vent the cone from rotating during flight Exhaust K Cone Thru Bolt Retaining Nut Tank Size and Orientation to Carburetor Ideally the stopper in the fuel tank should be even with the high speed ne
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