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