Yamaha F2.5A Service Manual page 138

TRBL
SHTG
Symptom: Engine does not accelerate when the throttle is opened quickly.
The engine turns off when the throttle is opened quickly.
Acceleration is tardy and the engine is likely to stop at any moment.
• Check the carburetors.
• Check the ignition system.
• Check the compression pressure of the power unit.
Check the throttle cable
operation.
Do the car-
buretor throt-
tle valves
close simul-
taneously?
Yes
Disassemble the carburetor and
check the internal parts for
clogs, debris, or wear.
Clogs, debris,
or wear?
Yes
Clean the carburetor or replace
the respective parts.
9-5
Troubleshooting
No
Adjust the throttle cable.
Check the ignition system and
No
the compression pressure of the
power unit.
69M3E11