11
Idle Stop Screw:
The idle stop screw adjusts the closure of the carburetor 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. If the carburetor barrel stays open
too far, the engine will idle very high and the clutch will never disengage. This will damage
the clutch very quickly. If the idle stop screw is closed too far, the engine may die during
idle. Ideally, the engine should idle smoothly, yet slow enough so that the clutch
stays disengaged.
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 valve clockwise to lean the mixture or
turn the needle valve counterclockwise to richen the mixture. When you start the engine
for the very first time, the high speed needle valve should be turned in completely, then
backed out 3 turns. When you start the engine after that, leave the high speed needle
valve in the same position it was in when you shut down the engine.
SECTION 4: BECOMING FAMILIAR WITH THE XTM RACING 24.7 NITRO ENGINE
Please refer to the photo at left to familiarize yourself with your engine's
carburetor. All of the carburetor settings come preset from the factory
for initial starting, but you should have a small flat blade screwdriver
handy to make adjustments to the carburetor during the break-in
process which will be detailed in the next section.
WARNING!! PLEASE READ THIS INFORMATION BEFORE PROCEEDING!!
Your X-Factor2 comes equipped with the user-friendly and powerful XTM Racing 24.7 nitro engine. Before starting the engine for the
first time, you MUST read this section very carefully. This section details the different parts of the engine's carburetor and how to
adjust the carburetor's needle valves to tune the engine. Failure to read this information may result in your not knowing how to
properly operate your new XTM Racing 24.7 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
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.
Do not adjust the low speed needle valve
until AFTER the engine has been broken in.
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 3 turns. This is the factory setting.
IMPORTANT TIP ABOUT READJUSTING THE LOW SPEED NEEDLE VALVE
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