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5) Procedure for adjustment.
a) Back out the main adjusting screw as specified.
Turns out:
1
±
1/8
b) Perform a running test.
To test. accelerate the
snowmobile by quickly pulling the throttle lever to
full-throttle position from idling ·position.
c) Perform a high-speed running test. and find the posi-
tion of the main adjuster screw where the engine
performance is the best.
The adjustment should be made by turning the
ad-
justing screw 118 turn each time.
d) After the high-speed running test, check the spark
plug for discoloration.
Adjust the main adjuster
screw so the spark plug porcelain has a tan color at
maximum high speed load.
e) Keep the snowmobile running at high speed, and
test the engine operating condition.
Repeat the
operations 2) to 5) above, and set the main adjuster
screw in the best position to achieve good spark
plug color.
Note:
If the factory setting is improper, making the mixture
too rich or too lean, the main adjusting screw should
be adjusted, starting from the position where it is
back out about 114 turn.
Fig. 2-42
-23-
ENGINE -
Carburetor
Fig. 2-43
2-5-12.
Carburetor
with
Accelerator
Pump
(GPX433F)
The accelerator pump is basically the same as in the
GP433F.
For details, refer to the GP338/GP433F Serv-
ice Manual.
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