-5-
Dirty or faulty spark plug
Clean/replace.
Defective air gap
Adjust.
Worn piston ring
Replace.
Worn piston
Replace.
Worn cylinder
Replace.
Expired oil seal service life
Replace.
Revolutions low for idling
Adjust.
Poorly adjusted carburetor ass’y
Adjust.
Defective sealing of the packing
Replace.
Revolutions low for idling
Adjust.
Poorly adjusted carburetor ass’y
Adjust.
Defective sealing of the packing
Replace.
Revolutions too high for idling
Adjust.
Worn or faulty clutch
Inspect/replace.
Poorly adjusted carburetor ass’y
Adjust.
Clogged fuel filter
Clean/replace.
Inadequate warm-up, especially in cold
weather
Warm up.
Poorly adjusted carburetor ass’y
Adjust.
Defective sealing of the packing
Replace.
Clogged cylinder vent passage, exhaust port
or carbon-clogged muffler
Clean.
Clogged air cleaner
Clean.
Chain brake set on
Release.
Poorly adjusted carburetor ass’y
Adjust.
Faulty carburetor ass’y pump diaphragm
Replace.
Dirt-clogged carburetor ass’y
Clean.
Dirt-clogged high-speed fuel line of the
carburetor ass’y
Clean.
Air intake from the packing section
Inspect.
Faulty carburetor ass’y pump diaphragm
Replace.
Poorly adjusted carburetor ass’y
Adjust.
Revolutions low for idling
Adjust.
Poorly adjusted carburetor ass’y
Adjust.
Defective sealing of the packing
Replace.
Clogged air cleaner
Clean.
Poorly adjusted carburetor ass’y
Adjust.
Does the engine stop when
the speed rapidly decelerates
from high speed?
Yes
Yes
No
No
Yes
Does the engine stop by
pulling the throttle lever?
No
No
Does the speed increase
by pulling the throttle lever?
Are revolutions fluctuated
during acceleration?
Tilt the tool during idling.
Does the engine stop?
No
Yes
Does the saw chain rotate
during idling?
Yes
No
Yes
Start the tool and set to
idling mode.
Does the engine stop?
Is fuel consumption
excessive?
Yes
No
No
Yes