Echo CS-330MX4 Instruction Manual page 25

Table 2
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.
Improper fuel used ........................................ Use fuel with correct mixing ratio. Never use
Spark plug defective (worn) ........................... Replace.
Engine
overheated
As cooling fins clogged, air
does not pass well ........................................ Clean fins.
Excessive deposits in
combustion chamber ..................................... Disassemble and remove carbon.
Firing function
Plug damaged or fouled ................................ Replace or clean.
defective
Combustion poor due to
defective wiring ............................................ Check wiring.
High-speed needle setting incorrect ............. Readjust.
Carburetor
Carburetor overflow ...................................... Refer to Table 1.
defective
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
Other
troubles
or worn out
Exhaust port clogged with carbon ................. Clean as necessary.
Throttle is not fully open ................................ Readjust.
Chain tension incorrect ................................ Adjust.
Chain does not cut
Chain wrongly set ......................................... Set correctly.
clean
Depth incorrect ............................................ Readjust.
Chain saw pressed against
tree to firmly ................................................. Press lightly.
Chain stops
(Clutch slips)
Clutch shoe worn out .................................... Replace.
No oil in tank ................................................ Refill.
Oil delivery incorrect ..................................... Adjust.
Chain poorly
lubricated
Oil contaminated with dust ............................ Rinse tank and fill with new oil..
Oil viscosity inappropriate ............................. Use oil with correct viscosity for summer or winter.
gasoline of poor quality.
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