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SDN2820
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CARBURETOR TUNING
SDN2830
2-39
Low-speed tuning
The carburetors are built so that low speed tuning
can be done by adjusting the pilot mixture screw
1 and throttle stop screw 2.
CAUTION:
Never run the engine without the air intake si-
lencer installed. Severe engine damage may re-
sult.
1. Tighten the pilot mixture screw until it is
lightly seated and then back it out the speci-
fied number of turns.
Pilot mixture screw 1:
1-1/8 turns out
Pilot mixture screw effects:
←
Turn in
STD setting
Leaner
Mixture
2. Set the engine idle speed by turning the throt-
tle stop screw in (to increase engine speed) or
out (to decrease engine speed).
Standard idle speed:
1,800 ± 100 r/min
3. 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 ob-
tained.
NOTE:
In this case, use a larger numbered pilot jet to
enrich the air/fuel mixture.
Standard pilot jet:
#42.5
INSP
ADJ
→ Turn out
Richer
Mixture
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