Control System; Carburetor Check And Adjustment - Yamaha F100A Wartungshandbuch

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CONTROL SYSTEM

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CONTROL SYSTEM

Carburetor check and adjustment

CAUTION:
Do not adjust the carburetor when it is
operating properly. Excess adjustment may
cause the engine poor performance.
1. Check:
Engine idling speed
Unstable → Adjust.
Refer to steps 3 and 4.
2. Check:
Vacuum pressure
Out of vacuum variation range →
Adjust.
Vacuum variation range:
Within 50 mm Hg
Refer to step 3 and 4.
3. Adjust:
Pilot screws
NOTE:
Depending on the model, each pilot screw
is covered with blind plugs.
Adjusting steps:
Turn in all of the pilot screws 1 until
they are lightly seated.
Turn out the pilot screws the specified
number of turns.
Pilot screw setting:
2 turns out
If the engine is unstable, turn the pilot
screws in until the engine idling speed
is down approximately 40 r/min, and
then return the screws 3/4 turns.
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