TRX 2.5R • 16
THE CARBURETOR
Tuning the engine means finding the
perfect balance between the two;
excellent power to meet your needs
while maintaining good lubrication
for long engine life.
The optimal fuel
mixture setting is rich
to provide a
safety margin against having a lean
condition if some variable changes
(such as the temperature from one
day to the next). General fuel mixture
settings are measured by the number of turns the needles are turned out from fully closed. The
fuel mixture settings have been pre-set from the factory to typical break-in settings. Do not
readjust your carburetor from the factory settings until after the engine is started and running,
and you have been able to observe the engine running to assess what minor adjustments may
be required to compensate for fuel, temperature, and altitude. Adjustments are usually made in
1/8 or 1/16-turn increments.
The Idle Speed Adjustment
The idle speed screw controls the closed position of the throttle slide. When the throttle servo
is in its neutral position, the throttle slide should be stopped against the idle adjustment screw.
Always use the idle speed adjusting screw to control engine idle. Do not use the throttle trim
on the transmitter to adjust idle speed. The idle speed should be set as low as possible and still
maintain reliable running.
Lean
Rich