Yamaha EF2800i Service Manual page 74

ENGINE SPEED IS UNEVEN
Check fuel level.
SUFFICIENT INSUFFICIENT
Check if fuel is deteriorated.
GOOD NO GOOD
Check if fuel cock is clogged.
GOOD NO GOOD
Check spark plug for dirt and
check spark plug gap.
GOOD NO GOOD
Measure valve clearance.
OUT OF SPECI-
GOOD
FICATION
While the engine is operating, pull
the choke knob approximately 1/3
to 1/2 way out, and then check the
engine operating condition.
STABLE UNSTABLE
Check for air suction due to a
damaged throttle shaft seal, car-
buretor joint, or gasket.
GOOD NO GOOD
Check if slow or main passages
such as, the pilot jet and main jet,
in carburetor are clogged.
GOOD NO GOOD
*
TROUBLESHOOTING
Add.
Replace.
Clean.
Clean or adjust.
Adjust.
Inspect from **.
Disassemble or replace.
Disassemble or clean.
3-46
ENG