
-4-
Weak spark
Fouled or defective spark
plug
Cleaning or
replacement
Improper fuel-air
mixture
Clogged fuel filter ass'y
Cleaning
Clogged carburetor
Cleaning
Defective carburetor ass'y
Inspection or
replacement
No compression
Worn piston rings
Replacement
Worn oil seals
Replacement
Broken magneto rotor ass'y key
Replacement
Improper fuel-air
mixture
Clogged fuel filter ass'y
Cleaning
Clogged carburetor
Cleaning
Defective carburetor ass'y
Inspection or
replacement
Improper fuel-air
mixture
Clogged fuel filter ass'y
Cleaning
Clogged carburetor
Cleaning
Defective carburetor ass'y
Inspection or
replacement
Clogged element of air cleaner ass'y
Cleaning
Carbon clogged in muffler, cylinder or
exhaust vents
Cleaning
Defective ignition coil ass'y
Replacement
Defective gasket or packing seal
Replacement
Improper carburetor adjustment
Readjustment
Defective carburetor ass'y
Inspection or
replacement
Defective carburetor ass'y
Inspection or
replacement
Idling adjustment of carburetor too high
Readjustment
Worn clutch section
Replacement
Yes
Does the engine accelerate when
throttle trigger is triggered?
Yes
No
Does the engine stop when the
choke lever is open?
Does the engine stop at idling?
Is fuel consumption excessive?
Does the cutting attachment
rotate at idling speed?
Engine starts. Does combustion
continue?
Yes
No
Yes
No
No
Yes
Yes
No