Yamaha EF7000 Service Manual page 140

Check if the electric equipment consumes too
much wattage for this generator.
GOOD
Check the spark plug for dirt and check the spark
plug gap.
GOOD
Check the air filter element for dirt.
GOOD
Check the compression pressure.
GOOD
ENGINE SPEED DOES NOT INCREASE
TOO MUCH
DIRTY OR OUT OF
SPECIFICATION
DIRTY
TOO HIGH
TOO LOW
Measure the valve clearance.
GOOD
Check the valve face and valve seat for wear.
GOOD
Check if the marks on the crankshaft and cam-
shaft are aligned.
GOOD
Check if there is seizure, wear, or damage on the
piston, piston ring, or cylinder.
GOOD
ENGINE
OUT OF
SPECIFICATION
WORN
NOT GOOD
SEIZURE OR WORN
6-5
TRBL
Remove the electric
equipment with too
much wattage.
Clean, adjust, or replace.
Clean.
Decarbonize the com-
bustion chamber if there
is carbon deposits.
Adjust.
Resurface or
replace.
Correct.
Rebore or
replace.