Table of Contents
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Engine starts.
Does combustion continue?
No
Yes
Does engine stop by opening the
choke lever? Does engine stop by
accelerating? Does the engine
speed fluctuate at high speed?
No
Yes
Does engine accelerate by
triggering the throttle trigger?
No
Yes
Does the engine speed fluctuate?
Yes
No
Is fuel consumption excessive?
Yes
No
Does the saw chain rotate at idling?
Yes
No
Stained or defective
spark plug
Weak spark
Improper air gap
Defective ignition coil
ass'y
Defective piston ring
Weak
Defective oil seals of
compression
crank case ass'y
Clogged carburetor
ass'y
Defective
carburetor ass'y
Clogged pump filter
Improper
body comp.
fuel-air mixture
Folded, improperly
connected or damaged
shield tube ass'y
Too low idling speed
Clogged carburetor
ass'y
Improper
Defective carburetor
fuel-air mixture
ass'y
Clogged pump filter
body comp.
Defective carburetor
ass'y
Improper
Clogged cleaner
fuel-air mixture
element of cleaner
ass'y
Carbon clogged in muffler, cylinder or
Exhaust vents
Faulty ignition coil ass'y
Degraded fuel
Clogged carburetor ass'y
Defective carburetor ass'y
Defective carburetor ass'y
Clogged cleaner element of cleaner ass'y
Idling adjustment of carburetor too high
Worn clutch section
Degraded clutch spring
-5-
Refer to
page
Clean or
7
replace.
Adjust.
8
Replace.
8
Replace.
12, 13
Replace.
12, 13
Clean.
10
Clean or
10
replace.
Clean or
9
replace.
Inspect or
9
replace.
Adjust.
10
Clean.
10
Inspect or
10
replace.
Clean.
9
Inspect or
10
replace.
Clean.
9
Clean.
9
Replace.
8
Replace.
Clean.
10
Inspect or
10
replace.
Inspect
or
10
replace.
Clean.
9
Readjust.
10
Replace.
11, 12
Replace.
11, 12
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