Hitachi CG 25EUAP (L) Service Manual page 6

Check that the engine speed
increases by pulling the throttle
lever.
The speed does
OK
not increase.
Check whether the speed
increases normally.
OK
The speed fluctuates.
Start the engine.
Check whether the engine can
be set to the idling state.
The engine stalls.
OK
Check whether the engine can
suddenly decelerate from high
speed.
The engine stalls.
OK
Check whether the cutter
blade begins rotating in the
idling state.
The cutter blade
begins rotating.
Cylinder exhaust port or muffler is clogged with
carbon.
Cleaner element is clogged.
Valve clearance is extended.
Carbon accumulated on a sealed valve surface.
High-speed fuel line of carburetor is clogged
with foreign matter.
Pump diaphragm of carburetor is faulty.
Air is suctioned through a gasket.
Valve clearance is extended.
Idling speed is too low.
Idling speed is too low.
Idling speed is too high.
Clutch is worn or faulty.
-5-
Clean.
Clean.
Inspect and
adjust.
Clean.
Clean.
Replace.
Inspect and
replace.
Inspect and
replace.
Adjust.
Adjust.
Adjust.
Inspect and
replace.