FUEL
Fuel system
4-19
60C5D11
Adjusting the pilot screw
1. Start the engine and warm it up for 5 min-
utes to check the stability of the engine.
Adjust the pilot screw if necessary.
2. Attach the special service tool to high-
tension cord #1
1
.
3. Turn the pilot screws
2
in direction
a
until the engine idle speed has
decreased to approximately 40 r/min,
then in direction
b
3/4 turn.
4. Turn the throttle stop screw
3
in direc-
tion
c
or
d
until the specified engine
idle speed is obtained.
NOTE:
• To increase the idle speed, turn the throttle
stop screw in direction
c
.
• To decrease the idle speed, turn the throttle
stop screw in direction
d
.
5. After adjusting the idle speed, rev the
engine a few times and let it idle for at
least 15 seconds to check the stability of
the engine. Adjust the carburetor syn-
chronization if necessary.
Digital tachometer: 90890-06760
Engine idle speed: 800–900 r/min
S60C4290
S60C4300
S60C4310
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