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CARBURETOR TUNING
Standard main jet
Main jet whose diameter is 10% smaller than
standard
Main jet whose diameter is 10% larger than
standard
CAUTION:
If the air filter case is removed from the car-
buretors, the change in pressure in the
intake will create a lean mixture that may
cause severe engine damage. The air filter
case has no effect on performance charac-
teristics and must be secured to the carbu-
retors
during
adjustment. Also, it must always be in
place when the engine is operated. Regu-
larly clean the air filter and keep it free from
obstructions.
Low-speed tuning
The carburetors are built so that low speed
tuning can be done by adjusting the throttle
stop screw
.
CAUTION:
Never run the engine without the air filter
case installed. Severe engine damage may
result.
1. Set the engine idle speed by turning the
throttle stop screw
speed) or out (to decrease engine speed).
Engine idle speed:
1,300 ~ 1,500 r/min
2. If low-speed performance is still poor at
higher elevations under extreme conditions,
the standard pilot jets may need to be
replaced. In this way, the proper air/fuel
mixture is obtained.
NOTE:
NOTE:
In this case, use a larger numbered pilot jet to
enrich the air/fuel mixture.
Standard pilot jet:
#45
14
INSP
ADJ
carburetor
tuning
in (to increase engine
and
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