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TRX 2.5, TRX 2.5R, & TRX 3.3 Racing Engine
Factory Break-In (default) Carburetor Settings:
High-Speed needle
TRX 2.5, TRX 2.5R, and TRX 3.3 Racing Engines:
A good starting point for the high-speed needle
is 4 turns out (counter-clockwise) from closed.
Low-Speed Needle
Notice the thin darker gray area between the low speed needle and the throttle arm.
This is actually the other end of the slide valve from inside the carburetor. The
low-speed needle is threaded into the slide valve and is set flush (even) with the edge
of the slide valve.
Note: This is a good base setting. Adjustments may
need to be made to the low-speed needle for best
performance in your running conditions.
Idle Stop Screw
Idle Gap
The idle stop screw controls the idle speed by preventing the carburetor slide from
closing completely. Turn right (clockwise) to increase idle, and left (counter-clockwise)
to decrease idle. A good starting point for the slide valve to stop at idle is a
0.7mm-1.0mm gap.
The carburetor is preset at the factory for break-in. The base setting should be right to
start and run the engine through the break-in process. However, if you are having
trouble getting the engine started or keeping it running, then you may need to readjust
the fuel mixture to compensate for factors such as temperature, humidity, and altitude
(air density). It is a good idea to bring the tuning card that was attached to the fuel tank
with you.
Factory Break-In (default) Carburetor Settings:
High-Speed needle
TRX 2.5, TRX 2.5R, and TRX 3.3 Racing Engines:
A good starting point for the high-speed needle
is 4 turns out (counter-clockwise) from closed.
Low-Speed Needle
Notice the thin darker gray area between the low speed needle and the throttle arm.
This is actually the other end of the slide valve from inside the carburetor. The
low-speed needle is threaded into the slide valve and is set flush (even) with the edge
of the slide valve.
Note: This is a good base setting. Adjustments may
need to be made to the low-speed needle for best
performance in your running conditions.
Idle Stop Screw
Idle Gap
The idle stop screw controls the idle speed by preventing the carburetor slide from
closing completely. Turn right (clockwise) to increase idle, and left (counter-clockwise)
to decrease idle. A good starting point for the slide valve to stop at idle is a
0.7mm-1.0mm gap.
The carburetor is preset at the factory for break-in. The base setting should be right to
start and run the engine through the break-in process. However, if you are having
trouble getting the engine started or keeping it running, then you may need to readjust
the fuel mixture to compensate for factors such as temperature, humidity, and altitude
(air density). It is a good idea to bring the tuning card that was attached to the fuel tank
with you.
