Yamaha F225F Service Manual page 158

TRBL
SHTG
Symptom 1: High engine idle speed.
Symptom 2
—
Symptom 1: Engine stalls, unstable engine idle speed, or poor acceleration.
Symptom 2
Improper intake cam
timing
4-33
Troubleshooting
Cause
Air leakage (throttle valve–cyl-
inder head)
Cause
Stuck OCV plunger
Clogged OCV filter
Clogged oil passage
Stuck VCT
Checking step
Check the gaskets of the intake mani-
folds, surge tank, and throttle body.
Checking step
Check the OCV valve operation using
the YDIS.
Check the OCV plunger.
Replace the OCV filter.
Check the oil passage.
Replace the VCT assembly.
See
page
6-14
6-20
See
page
5-32
5-32
7-53
2-28
7-42