Engine
Problem
(Continued)
Engine develops
power
loss or ru ns on one
cylinder
(Continued).
Engine overheats.
Engine backfires; has irregu-
lar
running
condition.
Note: Engine may
eventually
overheat.
Engine four-cycles.
3-4
TR
OUBLESHOOTING
Condition
4.
Filter
obstructed.
5.
Excessive
ca
rbon
buildup
in
exha ust
portIs).
6.
Defective
pulser coil.
7.
Damaged
or
worn
rings.
8.
Low
crankcase pressure.
9. Damaged piston.
10
. Damaged head gasket.
11. Broken (shorted) high
tension
leads.
12. Defective plug cap(s).
1. Incorrect spark plug(s).
2. Cooling
fins
obstructed.
3.
Air
leak
between
carbure-
tor and cylinders.
4. Caburetor adjusted in-
correctly.
5. Excessive carbon deposits
in
combustion
chamber, ex-
haust port or
muffler.
6.
Damaged rings caused by
excessive carbon buildup.
7. Fan
belt
loose or broken.
1. High
tension
lead
wire
shorting
out.
2.
Fouled or
incorrect
spark
pi
ug
(heat
ra
nge too hot).
3.
Air
leak
between
carburetor
and
cylinder.
1. Carburetor incorrectly ad-
justed.
2.
Dirt
between
needle valve
and valve seat.
Remedy
4. Clean or replace
filter
.
5.
Clean exhaust portIs).
6.
Replace pulser coil.
7. Replace
the
rings.
8.
Check crankcase
for
leaks;
replace
oil seal or gasket.
9. Replace piston and related
component(s).
10
. Replace gasket.
11
. Replace complete
ignition
coil.
12. Replace cap(s).
1.
Install correct spark plug(s).
2.
Clean cooling
fins
.
3.
Replace gaskets,
tighten
mounting
hardware.
4.
Adjust
carburetor.
5.
Clean affected components.
6.
Clean or replace
rings
.
7.
Adjust
tension
or
replace belt.
1. Replace complete
ignition
coil.
2.
Replace spark plug or in-
stall spark plug
having
colder
heat range.
3. Check
carburetor
holder
to
make sure it is
not
warped.
1.
Adjust
carburetor
.
2.
Service
carburetor
.
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