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Becoming Familiar with Your Engine
Please refer to the photo below to familiarize yourself with your engine's carburetor. You should have a small flat blade screwdriver
handy to make adjustments to the carburetor.
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For even more information about the XTM engine in your Baja Outlaw nitro truck, refer to the separate XTM Engine Instructions
included with your truck kit.
Idle Stop Screw:
The idle stop screw is preset from the factory and should not
require adjustment. The idle stop screw adjusts the closure of
the throttle barrel. We recommend that the idle stop screw be
adjusted so that the carburetor barrel stays open about 1/16".
Turning the screw clockwise will cause the barrel to stay open
more. Turning the screw counterclockwise will allow the barrel
to close more.
High Speed Needle Valve
The high speed needle valve is preset from the factory for the initial starting procedure. Do not make adjustments to it at this time. 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 counter-clockwise 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 is preset from the factory for the initial starting procedure. Do not make adjustments to it at this time. The
low speed needle valve meters the air/fuel mixture at idle and during transition from idle to full throttle. Turn the low speed needle
clockwise to lean the mixture. Turn it counterclockwise to richen the mixture. The low speed needle valve is preset from the factory,
but minor adjustments may need to be made to suit your application: fuel used, glow plug and environment all contribute to the setting.
To reset the low speed needle valve to the factory setting, follow these simple steps:
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Open the carburetor barrel completely.
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While holding the barrel open with your finger, use a small flat blade screwdriver to turn the idle mixture needle clockwise until it
stops. From this point, turn the needle counterclockwise 5-1/2 turns. This is the factory setting.
Fuel Recommendation
Fuel can make a big difference in the way your engine performs. For the break-in period you should use a fuel specifically designed for
R/C car engines that contains no more than 20% nitromethane. Once the engine has been adequately broken in (about 30 minutes of
run-time) you can switch to an R/C car fuel containing up to, but no more than, 30% nitromethane.
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We do not recommend using fuels designed for R/C airplane engine use. These fuels do not contain the proper amount of
lubricants; therefore, they will cause the engine to overheat and severe damage to the engine will result.
Glow Plug Recommendation
The glow plug can make a big difference in how your engine performs. We recommend using a "hot" type glow plug intended
specifically for performance engines like the Thunderbolt Standard Long # 115568 or the McCoy MC-59 # 690215. Do not use "cold"
glow plugs or those intended for four cycle airplane engines. Using the wrong type of glow plug will cause the engine to run erratically
and make it difficult to tune properly.
Air Filter
The air filter is a very important part of your engine. Failure to use the air filter will damage the engine in a very short period of time.
The foam air filter element needs to be oiled with after-run oil to work properly. See steps # 15 and # 16 in the Quick-Start Guide for
further information.
Breaking In the Engine
