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