Yamaha EF3000iSE Service Manual page 95

ENGINE SPEED DOES NOT INCREASE
Check if the electric equipment
consumes too much wattage for
this generator.
GOOD TOO MUCH
Check air filter element for dirt.
GOOD NOT GOOD
Check spark plug for dirt and
check spark plug gap.
GOOD NOT GOOD
Check valve clearance.
OUT OF SPECI-
GOOD
FICATION
Check if main passages such as,
the main jet, in the carburetor are
clogged.
GOOD NO GOOD
Check for air suction due to a
damaged throttle shaft seal, car-
buretor joint, or gasket.
GOOD NO GOOD
Check compression using com-
pression gauge.
TOO HIGH
GOOD
TOO LOW
**
Check if the timing marks on the
crankshaft and camshaft are
aligned.
GOOD NO GOOD
Check valve face and valve seat
for wear.
GOOD WEAR
Check if there is seizure or wear
on piston, piston ring, or cylinder.
SEIZURE OR
GOOD
WEAR
**
Check the condition of the throttle
control system. Refer to "THROT-
TLE CONTROL SYSTEM".
TROUBLESHOOTING
Use a generator with a larger capacity.
Clean.
Clean or adjust.
Adjust.
Disassemble or clean.
Disassemble or replace.
Decarbonize combustion chamber if there are
carbon deposits.
Correct.
Resurface or replace.
Rebore or replace.
3-54
ENG