Advertisement
u
CHAPTER 7. APPENDICES
7 -1.
TROUBLESHOOTING GUIDE
The
following
guide
is
not
complete
in itself. If
a problem is
found
within
an
individual
component mentioned in
the chart, refer to the
section or chapter
involved for inspection procedures.
1. Wil I not
start
or difficult to start
a.
Ignition
system
Possible
caus.
e
No spark
Weak or
irregular spark
b.
Air/Fuel
systems
Possible
cause
No
fuel
Irregular
or poor
fuel
flow
Bad fuel
Blocked air
intake
or
malfunction
Remedy
1. Check
ignition main
switch.
2.
Check
points
assembly.
3
. Che.ck
condenser.
4.
Check
wiring
magneto
coil.
5. Check ignition coil.
6.
Check
high
t ension lead.
7
.
Check
spark
plug.
8.
Check
ignition timing.
1. Use Electro
Tester,
spark gap
test.
2.
Check spark plug.
3.
Check
high tension
lead.
4.
Check
i11nition
assembly.
Remedy
1.
Check fuel
tank.
2.
Check
pet
cock.
3.
Remove
f
uel
pipe,
check
fuel flow
1.
Clean
fuel
tank,
check
cap
vent.
2
.
Clean petcock.
3.
Remove
carburetor, service.
1.
Flush
fuel
system completely.
2.
Add
fresh
fuel,
proper
grade.
1.
Clean
and
fuel
fi lter.
2
.
Check reed
valve assembly.
c. Engine/Exhaust systems
Possible cause
Remedy
Incorrect compression
pressure
1.
If compression
is too high, check
for excessive carbon buildup.
2.
No compression o.r low
compression
check:
a.
Cylinder
head gasket.
b. Cylinder base
gasket.
c. Piston, rings, cylinder.
Poor bottom
end compression
Check crankcase seals, left
and right.
Blocked
exhaust
system
1.
Check muffler/spark
arrester.
2.
Check
exhaust
port
carbon
formation.
3.
Check
exhaust
pipe for internal
damage.
2. Poor idle and/or
low
speed performance
a. Ignition system
Possible cause
Remedy
Fouled
spark plug or incorrect gap
Clean and
gap,
or
replace
if
necessary.
Improper
contact points
Clean and
gap,
or replace
if
necessary.
,ncorrect
ignition
tim ing
Reset
timing.
Weak spark
Check ignition
coil
and
condenser.
b.
Air/
Fuel
systems
Possible
cause
Remedy
Tank
cap
vent
plugged
Clean or
repair
as
necessary.
Fuel petcock
plugged
Clean or
repair
as necessary.
Carburetor slow speed
system
Clean o
r
repair as
necessary.
inoperative
Pilot
screw
incorrectly adjusted or
plugged
Adjust
or
clean
as
necessary.
Carburetor
float level
incorrect
Measure
and adjust
as
required.
Starter
leve
r
on
Push
lever
off.
Air leak
Repair.
Carburetor not
leve
l
Level.
-
8
3
-
Advertisement
Chapters
