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Dirty or faulty spark plug
Clean/replace.
Improper gap between magneto rotor
circumference and ignition coil
Adjust.
Worn piston ring
Replace.
Expired oil seal service life
Decompression valve trouble
Clean/replace.
Revolutions low for idling
Adjust.
Poorly adjusted carburetor ass’y
Revolutions low for idling
Adjust.
Poorly adjusted carburetor ass’y
Defective sealing of the packing
Replace.
Revolutions too high for idling
Adjust.
Poorly adjusted carburetor ass’y
Worn or faulty clutch
Inspect/replace.
Clogged fuel filter
Clean/replace.
Inadequate warm-up, especially in cold
weather
Warm up.
Poorly adjusted carburetor ass’y
Adjust.
Clogged cylinder vent passage, exhaust port
or carbon-clogged muffler
Clean.
Clogged air cleaner
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
Clogged air cleaner
Clean.
Poorly adjusted carburetor ass’y
Adjust.
Does the engine stop when
rapidly decelerating from
high speed?
Yes
No
Yes
Does the engine stop by
pulling the throttle lever?
No
Does the speed increase
by pulling the throttle lever?
Do revolutions fluctuate
during acceleration?
Tilt the tool during idling.
Does the engine stop?
Does the cut-off wheel
rotate during idling?
Start the tool and set to
idling mode.
Does the engine stop?
Is fuel consumption
excessive?
Yes
No
Yes
Yes
No
Yes
Yes
No
No
No
No
Yes