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Improper fuel used........................................ Use fuel with correct mixing ratio. Never use
gasoline of poor quality.
Spark plug defective (worn) ...........................Replace.
Ouput (engine speed) insufficient
Engine keeps running, but chain does not cut clean
Output (engine speed) sufficient
Engine
overheated
Firing function
defective
Carburetor
defective
Other
troubles
Chain does not cut
clean
Chain stops
(Clutch slips)
Chain poorly
lubricated
As cooling fins clogged, air
does not pass well ........................................Clean fins.
Excessive deposits in
combustion chamber ..................................... Disassemble and remove carbon.
Plug damaged or fouled ................................Replace or clean.
Combustion poor due to
defective wiring ............................................Check wiring.
High-speed needle setting incorrect ............. Readjust.
Carburetor overflow ...................................... Refer to Table 1.
Air cleaner clogged ..................................... Clean as necessary.
Compression insufficient
(piston ring stuck or worn out) ...................... Disassemble, check and replace if necessary.
Cylinder chromium plating peeled .................Replace cylinder
or worn out
Exhaust port clogged with carbon .................Clean as necessary.
Throttle is not fully open ................................Readjust.
Chain tension incorrect ................................ Adjust.
Chain wrongly set .........................................Set correctly.
Depth incorrect ............................................Readjust.
Chain saw pressed against
tree to firmly .................................................Press lightly.
Clutch shoe worn out .................................... Replace.
No oil in tank ................................................Refill.
Oil delivery incorrect .....................................Adjust.
Oil contaminated with dust ............................Rinse tank and fill with new oil..
Oil viscosity inappropriate .............................Use oil with correct viscosity for summer or winter.
Table 2
WARNING
DANGER
Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition spark by ground-
ing spark plug near cylinder plug hole, otherwise serious personal injury may result.