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1. Operations Guide Not responsible for errors All prices subject to change without notice Losi a Division of Horizon Hobby Inc Losi a Division of Horizon Hobby Inc 800 0394 Introduction Thank you for choosing the Losi 8IGHT T 2 0 RTR Truggy This is a highly developed off road model that features a sophisticated computer based radio system and does require some mechanical experience and direct adult supervision This guide contains the basic instructions for operating and maintaining your new Losi 8IGHT T 2 0 RTR Please take the time to read through it completely before running the model In addition to the service information available in this operations guide our online Support Answer Center is available at www Losi com for performance tips and troubleshooting questions Also included with your 8IGHT T 2 0 RTR is a 8IGHT T 2 0 Race Roller Owners Manual This manual can be used to reference how the vehicle is assembled and also includes build and setup tips Your hobby dealer cannot under any circumstances accept a model for return or exchange that has been run Customer Support Contact Horizon Hobby Inc 4105 Fieldstone Road Champaign IL 61822 1 877 504 0233 productsupport horizonhobby com STAY CONNECTED REGISTER YOUR PRODUCT ONLINE Register your product online so we can notify you about the latest option parts product updates tech tips service bulletins and more Visit www losi com and follow the P
2. Understanding Rich and Lean Fuel Mixture Adjusting the carburetor is one of the most critical facets of running a nitro powered RC vehicle The fuel mixture is referred to as being rich when there is too much fuel and lean when there is not enough fuel for the amount of air entering the engine The amount of fuel entering the engine is adjusted with high and low speed threaded needle valves The low speed needle is located in the front of the moving slide The high speed needle sticks straight up at the back of the carburetor Both feature a slotted head that is used as a reference and receptacle for a flat blade screwdriver for adjustments The mixture is made richer by turning the needle counterclockwise and leaner by turning clockwise An overly rich mixture will yield sluggish acceleration and performance with thick smoke from the exhaust A lean mixture can cause the engine to hesitate before accelerating or in some cases to lose power momentarily after the initial acceleration A lean mixture also makes the engine run hotter than desired and does not provide enough lubrication for the internal engine components causing premature wear and damage It is always advisable to run the engine slightly rich and never lean to avoid overheating and possible damage Engine Tuning After the engine is broken in you can tune it for optimum performance When tuning it is critical that you be cautious of overheating as severe damage and premature wear can o
3. immediately richen the mixture by turning the high speed needle counterclockwise at least two hours and be prepared for further adjustments before running any more Note The normal operating temperature as seen on your radio screen should be in the 190 to 230 F 88 to 110 C range Page 4 Carb Adjustments Make all carburetor adjustments in one hour increments Imagine the slot in the needle is the hour hand on a clock Adjust it as though you were moving the hour hand from one hour to the next or previous one Low Speed Needle As you turn this clockwise leaner less fuel enters the engine Turning it counterclockwise richer allows more fuel to enter the engine High Speed Needle As you turn this clockwise leaner less fuel enters the engine Turning it counterclockwise richer allows more fuel to enter the engine Rich E N Cane A N Idle Speed Adjustment As you turn this clockwise it increases the carburetor opening at idle and increases idle speed Turning it counterclockwise decreases the opening and decreases idle speed Base Carburetor Start Up Settings from the Factory If you find that your engine will not run properly it is advised that you return the carburetor settings to their factory settings This is done by slowly screwing the needles in clockwise until you feel resistance You will know that the needle is bottomed out Then follow the specs
4. 13 LOSR2216 LOSR2214 LOSR2223 LOSR2314 LOSR2228 Engine Components LOSR2201 LOSR2210 LOSR2211 LOSR2213 LOSR2214 LOSR2215 LOSR2216 LOSR2217 LOSR2218 LOSR2219 LOSR2222 LOSR2223 LOSR2224 LOSR2225 LOSR2228 LOSR2314 LOSB5051 Losi 454 Engine Non Pull Start esssseesssseesssseesssecessseen 239 99 Piston Sleeve 8 Port 454 ssssssssssesssssseessseeessssercessssreresssses 69 99 Connecting Rod w Wrist Pin amp Clips 454 wees 46 99 Crankcase ALUM 454 csscsscsssscssosssscssossesossessssonsacoseansace 69 99 Crankshaft Standard w o PS 454 ccessssssssessessesseseeseees 69 99 Front Bearing 26 427 454 ccesessssssesssssssessssesesesseseeeees 9 49 Rear Bearing 26 427 454 cscsssesssssssessssesessssessesesseeseees 24 99 Combustion Chamber 454 sessessesssseesestsseesesseseeseeee 10 99 Head Gasket 2 454 sscsssscssssossssssssssssssssossscossecoseeeeseeesses 3 99 Cooling Head Orange 454 esessssessseeesessesseseseeseeen 49 99 Carburetor 9 5MM 26 427 454 u ccsssssessssesseseseeeeen 49 99 Carb amp Backplate O Rings 26 427 454 eeeesesseseees 7 99 Hi Speed Needle Assembly 26 427 454 cccseseeee 15 99 Carb Dust Boot 26 427 454 cccsesssesessssesseseseesseseeeeeees 7 99 Screw amp Carb Pinchbolt Set 13 454 wn ssssessesesseseees 9 99 Standard Backplate 26 350 427 454 csesesesseseees 12 99 Exhaust Header Seals amp Springs 26 350 427 45
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6. 4 6 99 2009 Horizon Hobby Inc Losi engines are manufactured in Taiwan and distributed worldwide by Horizon Hobby Inc 4105 Fieldstone Rd Champaign IL 61822 Customer support 1 877 504 0233 www horizonhobby com www losi com Page 11 FCC Information This device complies with part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any interference received including interference that may cause undesired Operation Caution Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This product contains a radio transmitter with wireless technology which has been tested and found to be compliant with the applicable regulations governing a radio transmitter in the 2 400GHZz to 2 4835GHz frequency range CE Compliance Information for the European Union Instructions for Disposal of WEEE by Users in the European Union This product must not be disposed of with other waste Instead it is the user s responsibility to dispose of their waste equipment by handing it over to a designated collection point for the recycling of waste electrical and electronic equipment The separate collection and recycling of your waste equipment at the time of disposal will help to conserve natural resources and ensure that it is recycled in a ma
7. below for both the High and Low Speed Needle This will get you to a point that you can start over again High Speed Needle 2 turns out from the bottom Low Speed Needle 2 turns out from the bottom About Glow Plugs The glow plug is like the ignition system in your automobile The coiled element in the center of the plug glows red hot when connected to a 1 5 volt battery located in the igniter This is what ignites the fuel air mixture when compressed in the cylinder After the engine fires the heat generated by the burning fuel keeps the element hot Common reasons for the engine not starting are the 1 5 volt battery being weak the glow plug being wet with fuel or the element burned out Use a spare glow plug to check the igniter If the igniter makes the element glow remove the plug from the engine to check it in the same manner A wet glow plug means there is excess fuel in the engine To eliminate this with the glow plug removed and the model on the starter box put a rag over the head and turn the engine over a few seconds This will remove the excess fuel in the engine Reinstall the glow plug making sure you have the brass gasket on it The engine should start now We recommend the Dynamite DYN2495 Glow Plug as this is the best glow plug for this engine The DYN2495 Glow Plug has been designed to deliver an ideal balance of performance and longevity Testing the Temperature Although the DX3S radio offers temperature read
8. ccur You want to make all carburetor adjustments in one hour increments Page 3 Carburetor Adjustments Make all carburetor adjustments in one hour increments Imagine the slot in the needle is the hour hand on a clock Adjust it as though you were moving the hour hand from one hour to the next or previous one Low Speed Adjustment The low speed adjustment affects the idle and slightly off idle performance The optimum setting allows the motor to idle for at least 8 10 seconds The model should then accelerate with a slight amount of sluggishness and a noticeable amount of smoke The simplest way to check this is to make sure the engine has been warmed up and let the engine idle for 8 10 seconds If the low speed mixture is so far off that the engine won t stay running that long turn the idle speed screw clockwise increasing the idle speed With the engine at idle pinch and hold the fuel line near the carburetor cutting off the flow of fuel and listen closely to the engine rpm speed If the low speed needle is set correctly the engine speed will increase only slightly and then die If the engine increases several hundred rom before stopping the low speed needle is too rich Lean the mixture by turning the needle clockwise one hour and trying again If the engine speed does not increase but simply dies the needle is too lean and needs to be richened up by turning the needle counterclockwise one hour before trying agai
9. hout the tires rotating when the trigger is at its neutral position If not tap the trim lever found just above and to the left of the steering wheel to reposition the throttle servo and close the carburetor and apply more brake Note that additional braking force is applied when you push the trigger forward Telemetry Sensors The battery power of the receiver pack will automatically register on the readout screen on the radio The engine temperature sensor is installed around the head just above the head bolts as seen in the photo The temperature sensor needs to be always mounted in this location for accurate temperature readings The RPM Speed Sensor SPM1452 is mounted directly in the side of the radio tray near the center differential ae Temperature Sensor Sensor Page 6 Maintenance In addition to the service needs pointed out in this guide you should try to maintain your new 8IGHT T 2 0 RTR for proper performance and to prevent wear If dirt gets in the moving parts it can seriously hinder the performance of the model Use compressed air a soft paintbrush and or toothbrush to remove dirt and dust Avoid using solvents if possible as this can actually wash the dirt into bearings and areas not accessible without disassembly causing additional wear We suggest you follow these basic guidelines e Remove as much freestanding dirt and dust as noted above e Never leave fuel in the tank for more than a couple of hou
10. n After you have optimized the low speed setting the engine will probably be idling faster You will have to adjust the idle speed screw counterclockwise to slow the engine idle soeed down The engine should accelerate at a constant pace without hesitating High Speed Adjustment After initial acceleration the engine should pull at a steady rate while maintaining a two stroke whine and a noticeable trail of smoke If the engine labors and is sluggish with heavy smoke the mixture is too rich and needs to be leaned by turning the high speed needle clockwise in one hour increments until it runs smoothly If the engine isn t smoking or starts to die after acceleration it is too lean and you must richen the mixture by turning the needle counterclockwise Don t be confused by the sound of the engine and the actual performance A leaner mixture will produce an exhaust note with a higher pitch but this does not necessarily mean improved performance as the engine is on the verge of overheating and may incur possible damage Ideally you want to run the engine so that it is on the slightly rich side of optimum This will give you the best combination of speed and engine life CAUTION The engine is too lean and overheating if it accelerates rapidly with a high pitched scream then seems to labor stops smoking or loses speed This can be caused by the terrain atmospheric conditions or drastic altitude changes To avoid permanent engine damage
11. ned engine life During break in and when running always use Losi Nitrotane 20 Sport Fuel Although the carburetor is pre adjusted at the factory you must be familiar with the following adjustments and break in procedure If you change fuel or run in dramatically different environments hot cold high low elevation etc you will probably have to adjust at least the high speed needle to prevent overheating and maintain proper performance Never under any circumstances allow the engine to rev freely with the wheels off the ground Break In Procedure 1 The first three tanks of fuel should be run with the high and low speed needles noticeably rich see explanation below There should be a slight sluggishness and thick smoke when accelerating with the smoke decreasing as the model gains speed At speed there should still be a noticeable trail of smoke from the exhaust pipe Run the model on a flat surface in an oval pattern Ease into the throttle as you accelerate on the straight sections easing off as you approach turns letting the model roll through the turn before easing back on the throttle This will also allow you to get a feel for the steering response and handling characteristics of the model 2 You can also break in the engine by placing the model against a wall or fixed object on top of the starter box and allowing the engine to idle through two full tanks of fuel You may have to lean the low speed mixture slightly as noted below
12. nner that protects human health and the environment For more information about where you can drop off your waste equipment for recycling please contact your local city office your household waste disposal service or where you purchased the product Z CCO The associated regulatory agencies of the following countries recognize the noted certifications for this product as authorized for sale and use n oe oe ro e ple fw ufa zis w w s ajola e a ww for or ow 2009 Horizon Hobby Inc Printed 03 09 Age Recommendation Age Recommendation 14 years or over This is not a toy This product is not intended for use by children without direct adult supervision Declaration of Conformity in accordance with ISO IEC 17050 1 No HH2009031802 Product s Losi 8IGHT T 2 0 RTR Item Number s LOSB0085 Equipment class 2 The object of declaration described above is in conformity with the requirements of the specifications listed below following the provisions of the European R amp TTE directive 1999 5 EC EN 300 328 V1 7 1 Technical requirements for Radio equipment EN 301 489 1 v 1 6 1 General EMC requirements EN 301 489 17 v 1 2 1 Signed for and on behalf of Horizon Hobby Inc Champaign IL USA Mar 18 2009 Steven A Hall we ee Dek Vice President International Operations and Risk Management Horizon Hobby Inc The Spektrum trademark is used with permission of Bachmann Industries Inc
13. o touch these parts especially when refueling e The engine can be loud especially when run in a confined area If you find the noise objectionable use ear protection e This model is controlled by a radio signal that is subject to interference from sources outside your control Interference can cause temporary loss of control so it is advisable to always keep a safety margin in all directions to avoid collisions e Always operate your model in an open area away from people and cars The potential speed of this model can cause injury or damage Required Equipment You will need the following items to operate your new 8IGHT T 2 0 RTR e Losi Nitrotane 20 Sport Fuel LOSFO020 or LOSF0120 Nitrotane is the only fuel recommended by Losi for the included nitro engine e Fuel bottle LOSB5201 e 2 7 2V batteries LOSB9900 and charger for the Starter Box e Rechargeable Glow Igniter LOSB5221 e Charger for receiver battery Page 2 Tools You Will Find Handy In addition to the tools included with your vehicle you will find the following both useful and in some cases necessary Small flat blade screwdriver e Phillips screwdrivers e Needle nose pliers e Quality 050 inch 1 16 inch 5 64 inch and 3 32 inch hex Allen drivers LOSA99104 Engine Break In and Adjustments Breaking in your new engine is critical for proper performance Failure to follow the break in procedures can cause damage and shorte
14. out the following is a handy backup method The ideal operating temperature for the engine will vary with the air temperature but in general it should be in the 190 to 230 F 88 to 110 C range A simple way to check the engine temperature is to put a few drops of water on the top of the head heat sink It should take 3 5 seconds for the water to evaporate If it boils away quickly the engine is overheating and the high speed needle needs to be richened turned counterclockwise at least two hours With the DX3S radio you will notice the engine runs cooler when the vehicle is being driven This is obviously true as air is passing through the fins on the head cooling the engine In order to obtain an accurate temperature reading from the engine stop the car in a safe area and let the engine idle for 10 seconds You will notice that your engine temperature on the radio will increase and then stabilize Once the temperature stabilizes this is your true engine temperature Page 5 About the Radio The Spektrum DX3S radio installed in the 8IGHT T 2 0 RTR is a professional level system with more than the usual features you may find useful Be sure to read through the included radio manual for complete instructions The following is a simple guide referring to items that are commonly used and or needed to run your model 7 8 Radio Operation It is important that you familiarize yourself with the radio system as this is your direct link
15. peed fuel mixture too lean Spoiled or improper fuel Cooling air is being blocked Clean head fins Excessive load on the engine Check for binds dirt build up Engine hesitates or stumbles Engine overheated See Engine Tuning richen 2 hours High speed mixture too lean See Engine Tuning richen 2 hours Low speed mixture too rich See Engine Tuning richen 1 hour Air bubbles in fuel line Check fuel line for holes Glow plug fouled Change glow plug Engine stalls instantly when throttle is fully opened from idle cccc000 Glow plug fouled Change glow plug High speed mixture too rich See Engine Tuning Low speed mixture too lean See Engine Tuning richen 1 hour Engine stalls while driving around ICING AE EEE E EE EEE A E PEA Fuel level is low Add fuel Idle speed set too low Increase idle speed Engine stalls while idling 08 Low speed mixture too rich See Engine Tuning Low speed mixture too lean See Engine Tuning Idle speed too low Clutch shoes dragging Increase idle speed Check for broken clultch springs Clutch bearings failed Engine worn out Check Clean Replace Rebuild Page 10 Losi 454 Rear Exhaust Engine LOSR2228 LOSR2219 LOSR2217 CARBURETOR LOSR2222 LOSR2218 LOSR2224 LOSR2223 LOSR2210 LOSR2211 LOSR2223 2L Ss LOSR2223 LOSR2223 O LOSR2223 LOSR2211 LOSR2225 LOSR2211 0 LOSR2222 LOSB5051 LOSR2215 LOSR2228 LOSR22
16. roduct Registration link to stay connected Safety Precautions Age Recommendation 14 years or over This is not a toy This product is not intended for use by children without direct adult supervision THIS IS NOT A TOY The 8IGHT T 2 0 RTR is a sophisticated high performance radio controlled model which needs to be operated with caution and common sense Failure to operate this model in a safe and responsible manner could result in personal and or property damage It is your responsibility to see that the instructions are followed and precautions adhered to The 8IGHT T 2 0 RTR is not intended for use by children without direct adult supervision Losi and Horizon Hobby shall not be liable for any loss or damages whether direct indirect special incidental or consequential arising from the use misuse or abuse of this product or any product required to operate it This is still a model don t expect it to do unrealistic stunts Warnings e Fuelis dangerous if handled carelessly Follow all directions and precautions on the fuel container e Keep fuel and all chemicals out of the reach of children e Always keep the fuel container closed and never use around an open flame or while smoking e The exhaust emits poisonous carbon monoxide fumes Always run the model in a well ventilated area and never attempt to run it indoors e The top of the engine and the exhaust pipe are extremely hot during and for a time after use Use caution not t
17. rs e When done running for the day or longer let the engine run out of fuel Remove the air cleaner and pour a small amount of WD40 or quality after run engine oil into the carburetor and spin the engine over a few seconds e If needed replace the air cleaner before installing it back on the model e Inspect the chassis for worn broken or binding parts and repair as necessary Servicing the Clutch The 8IGHT T 2 0 RTR comes with a 4 shoe aluminum clutch that needs to be maintained periodically for optimum performance You will notice that when the vehicle is new the acceleration will be very linear the sound of the engine increasing in rom will equal as the vehicle increases in speed Once you find that your acceleration is decreased but the engine rpm is higher than before it is probably time for a new clutch On the right is a picture of a new clutch This is how the clutch shoes look prior to running the vehicle Below is a used clutch You will notice the edges of the shoes are mushroomed over Generally the more that the shoes are mushroomed over the more the shoes are worn Whenever you need to rebuild your clutch we recommend the following tips First of all be sure to clean all parts with Losi Nitrotec Spray Cleaner LOSA99217 to ensure there is no oil or debris on any of the parts Cleaning will include all the clutch parts including the clutch bearings We like to spray out the clutch bearings to ens
18. ted 8IGHT T 2 0 Race Roller Manual that is included with the model It is recommended after 4 to 6 hours of use to check the differential fluid levels of each differential Simply open each differential to check the fluid level and top off if needed The 8IGHT T 2 0 RTR comes with Losi Silicone Diff Fluid 7000 wt LOSA5281 in the front differential 10000 wt LOSA5282 in the center differential and 3000 wt LOSA5279 in the rear differential Rebuilding Refilling the Shocks The 8IGHT T 2 0 RTR comes with oil filled shocks The oil in the shocks is 35 wt and should be replaced with Losi 35 wt oil LOSA5225 Instructions on shock assembly are located on page 19 in the 8IGHT T 2 0 Race Roller Manual that is included with the vehicle Fuel Tank The 8IGHT T 2 0 RTR comes preinstalled with a fuel tank insert to meet ROAR and RC Pro Series 150cc fuel tank rules If you are not racing your 8IGHT T 2 0 RTR where these rules apply you can remove the insert to allow for an additional 5cc of fuel for longer run times j rn F Fueltank P Insert NEC Page 8 Quick Reference Guide High Speed Needle 2 turns out from bottom Low Speed Needle 2 turns out from bottom Linkage Measurements 142 50mm Q p Front Camber Linkage Losi 35 wt Shock Oil LOSA5225 ona J FO O jx 7 TO Rear Camber Linkage Steering Linkage Page 9 Customer Support Customer Support Horizon Hobby Inc Trou bleshoo
19. ti ng Cha rt Horizon Hobby Inc 4105 Fieldstone Road 4105 Fieldstone Road Champaign IL 61822 Champaign IL 61822 1 877 504 0233 1 877 504 0233 Problem Things to Check Remedy Engine won t Staft se sseesseesseesseesseesse Out of fuel Spoiled or improper fuel Glow plug not lighting Check replace glow plug Glow igniter battery low Charge change battery Engine overheated Let cool see Testing the Temperature Engine flooded Clean and reoil aircleaner Air cleaner blocked Exhaust blocked Engine won t turn OV f ssessesssessesss Engine is flooded Loosen glow plug and try again Engine seized Damaged if will not turn over Engine starts then Stalls eee Idle speed set too low See Carburetor Adjustments Glow plug is fouled weak See About Glow Plugs Air bubbles in fuel line Check for split hole in fuel line Engine is overheated See Testing the Temperature Insufficient fuel tank pressure blockage Clear pressure line Engine performing poorly 000 High speed fuel mixture is too rich See Engine Tuning Engine overheating See Engine Tuning richen 2 hours Leaking glow plug Replace glow plug Carburetor dirty or blocked Fuel bad or contaminated Try fresh fuel Clutch or slipper slipping Clean Adjust Repair Bound up drivetrain Check for binds in drivetrain Engine worn out Rebuild Engine OVErNeatS cecscesesececessesesesees High speed fuel mixture is too lean See Understanding Rich and Lean Low s
20. to the model Power Switch Turns your transmitter ON and OFF Steering Wheel Controls the steering of your model Steering Trim Tab Allows you to fine tune the neutral position of the steering Throttle Trigger Pull back for throttle and push forward for brakes Throttle Trim Tab Allows you to set the idle brake of the model Transmitter Display Digital readout shows battery voltage temperature rpm speed and functions settings Transmitter Antenna Transmits signal to the receiver in the model AUX Auxiliary which is not used on the 8IGHT T 2 0 RTR Never run your model with low receiver or transmitter batteries Always fold the antenna to the upright position before running your model Never leave the power on or the batteries will not last long Always turn the transmitter ON before turning the model ON When finished running always turn the model OFF before the transmitter For best operation it will be necessary to keep the trims adjusted for both the steering and throttle as noted on the following pages Steering Trim The model should go straight without turning the steering wheel If not tap the trim lever found just above and to the right of the steering wheel in the direction needed for the model to go straight Each tap of the trim button will be accompanied by an audible tone indicating a change has been made It may take several taps to get the correct trim setting Throttle Trim The model should idle wit
21. ure that there is no grease slung from the bearings at high rom which would cause premature Used clutch with clutch wear or slippage When reinstalling the clutch slightwear eee Ds Wear on y a gt clutch shoes Clutch Shoe Removal In order to remove your clutch shoes from the flywheel remove these four screws with a 1 16 inch hex wrench threadlocking compound on the clutch pins By using Losi Lok on this part it only makes it difficult to remove the pins Once the new shoes are installed pull back each clutch shoe 1mm to make sure they spring back into position to ensure proper movement You will also want to make sure the clutch bell has anywhere from 25mm to 50mm of free play from side to side and spins freely on the crankshaft You can use Losi s Metric Shim Set LOSA6356 to dial this in clutch shoes properly Now that your clutch is rebuilt it is time to break it in This is done by starting your buggy and having it idling on the ground While firmly holding the vehicle down on the ground apply 1 2 throttle for three seconds Repeat this three times to fully seat in your new clutch pins we recommend NOT using any type of Losi Lok or Page 7 Servicing the Differentials The 8IGHT T 2 0 RTR is equipped with heavy duty differential cases that are filled with silicone oil inside of all three differentials To understand how each differential needs to be removed please refer to the illustra

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