Table 2
Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition spark by
grounding spark plug near cylinder plug hole, otherwise serious personal injury may result.
Improper fuel used
Spark plug defective (worn)
Engine
overheated
As cooling fins clogged, air does not pass well
Excessive deposits in combustion chamber
Firing function
Plug damaged or fouled
defective
Combustion poor due to defective wiring
High-speed needle setting incorrect
Carburetor overflow
Carburetor
defective
Air cleaner clogged
Compression insufficient (piston ring stuck or
worn out)
Cylinder chromium plating peeled or worn out
Other
troubles
Exhaust port clogged with carbon
Throttle is not fully open
Chain tension incorrect
Chain does not cut
clean
Chain wrongly set
Chain stops
Depth incorrect
Chain saw pressed against tree too firmly
(Clutch slips)
Chain poorly
Clutch shoe worn out
No oil in tank
Oil delivery incorrect
lubricated
Oil contaminated with dust
Oil viscosity inappropriate
WARNING
Use fuel with correct mixing ratio. Never use
gasoline of poor quality.
Replace.
Clean fins.
Disassemble and remove carbon.
Replace or clean.
Check wiring.
Readjust.
Refer to Table 1.
Clean as necessary.
Disassemble, check and replace if
necessary.
Replace cylinder
Clean as necessary.
Readjust.
Adjust.
Set correctly.
Readjust.
Press lightly.
Replace.
Refill.
Adjust.
Rinse tank and fill with new oil..
Use oil with correct viscosity for sum-
mer or winter.
DANGER
27