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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 valve
clockwise to lean the mixture. Turn the low speed needle valve 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. If you need to reset the low speed needle valve to the factory setting, follow these simple procedures:
●
Open the carburetor barrel completely.
●
While holding the carburetor barrel open with your fingers, use a flat blade screwdriver to turn the low speed needle valve clockwise
until it stops. From this point, turn the low speed needle valve counterclockwise 8-1/2 turns. This is the factory setting.
SECTION 6: FUELING AND STARTING THE XTM RACING 24.7 NITRO ENGINE
❑ Lift the fuel tank lid and carefully fill the fuel tank until the fuel level is just below the top
of the tank.
✦✦
✦✦
✦WARNING
✦✦
✦✦
✦ Use fuel that is appropriate for nitro car and buggy engines. Do not
use gasoline or diesel fuel!
❑ Prime the engine by first opening the throttle completely and covering the exhaust
opening in the tuned pipe with your thumb, then pull the pull-starter cord several times
until you see fuel just start to enter the carburetor through the fuel line.
✦✦
✦✦
✦IMPORTANT
✦✦
✦✦
✦ Do not pull the cord all the way out or damage to the pull-starter will
occur. Use a couple of short pulls - about 7 or 8 inches long.
❑ Using your glow plug wrench, verify that the glow plug is installed in the cylinder head and tight. If it's not already preinstalled, install
it using one copper gasket.
If at any time the pull-starter becomes very tight or difficult to pull - STOP! The engine has become flooded and the excess fuel
must be removed from the engine or damage to the pull-starter and/or engine could occur. To remove the excess fuel from the
engine follow the procedures listed below:
●
Completely close the high speed needle valve until it bottoms out.
●
Remove the glow plug from the cylinder head.
●
With a rag over the top of the engine, pull the pull-starter cord several times to expel the excess fuel from the engine.
●
Check to make sure that the glow plug has not been fouled, then reinstall it.
●
Reset the high speed needle valve 3 turns out from bottom.
WARNING!! PLEASE READ THIS BEFORE STARTING YOUR ENGINE FOR THE FIRST TIME!!
✦✦
✦✦
✦WARNING
✦✦
✦✦
✦ Under no circumstances should you operate the engine without the air filter installed on the carburetor. The air filter
prevents dust and debris from entering the engine and damaging it. If you operate your engine at any time without the air filter
installed, the engine will not be covered under warranty should it need repair.
If, during the break-in process, the pull-starter assembly slips when you try to start the engine, the one-way bearing and
pull-starter shaft may be coated with excess fuel oil. If this is the case, carefully remove the one-way bearing and the pull-starter
shaft, clean them with rubbing alcohol and reassemble the parts. Use the engine exploded parts view included with your truck to see
how the parts are assembled. Also, be careful when removing the pull-starter assembly to ensure that the recoil spring does not blow out.
PRO TIP
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