GENERAL SERVICE INFORMATION
2-37
1-/ 2-Cylinder
Jet Needle Adjustment
CAUTI0N
The 2.5
/
3.5 carburetor is properly adjusted when
shipped from the factory. No adjustment should
be made to the carburetor unless absolutely
necessary.
• The jet needle is held in position by a spring clip which fits into
one of four grooves on the needle. Moving the clip to a higher
groove will make the mixture leaner, and moving the clip down
will produce a richer mixture.
All Other Engine Carburetors
Covers: 5 Model
8/9.8 Models
9.9/15/18 Models
25/30 Models
40 Model
NOTE
Adjust idling speed after warm-up operation.
Adjustment Procedure
• Set the pilot adjust
screw to the standard reverse turns, and
adjust the engine rpm by using the pilot adjusting screw and
throttle stop screw while monitoring the tachometer.
• The engine rpm should reach maximum when the pilot adjusting
screw is within +/- 1/4 turns of the standard position.
Replace the pilot adjusting screw if the tip is worn.
Idling Speed
ln Neutral ln Gear Pilot Adjusting Screw :
Number of turms
5
1000 RPM 850 RPM 1 ± 1/4
8
/
9.8
950 RPM 750 RPM 8 : 1-3/8 ± 1/4,9.8 : 2 ± 1/4
9.9
/
15
/
18
950 RPM 800 RPM 9.9D
2
/15D
2
/18E
2
: 2 ± 3/4
25
/
30
1050 RPM 900 RPM
25C
3
/30A
4
1-1/4 ± 1/4
40
1000 RPM 850 RPM 1-1/4 ± 1/4
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