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14-2
APPENDIX
...........................................................
"
Troubleshooting Guide
.................................. ...........
........
........
NOTE
o This is
not
an exhaustive
list, giving every possible
cause
for
each
problem
listed.
It
is
meant simply
as
a
rough
guide
to assist
the
troubleshooting for
some of
the
more common
difficulties.
Engine Doesn't
Start;
Starting
Difficulty:
Engine won't tum
over:
Cylinder. piston seizure
Crankshaft
seizure
Connecting
rod
small
end
seizure
Connecting rod big end
seizure
Transmission
gear or
bearing
seizu re
Kick
shaft
retu
rn
spring
broken
Kick ratchet gear not engaging
No fuel flow
:
No fuel
in
tank
Fuel
tap turned
off
Tank
cap
air
vent obstructed
Fuel tap dogged
Fuel line
clogged
Float
valve clogged
Engine
flooded
:
Fuel
level too high
Float valve worn
or
stuck
open
Starting technique faulty
(when
flooded,
kick with the
throttle
fully open
to
a
llow
more air
to
reach
the engine.)
No
spafk;
spa~
weak:
Spark plug
dirty,
broken,
or
maladjusted
Spark plug cap
or
high tension wiring trouble
Spark plug cap not in good
contact
Spark plug incorrect
COl
unit
trouble
Ignition coil
trouble
Ignition
coil
resistor
open
Flywheel
magneto damaged
Wiring shorted
or
open
Fuellalr
mixture incotTect
:
Idle adjusting
screw
maladjusted
Slow
jet
or
air passage clogged
Air
cleaner
clogged,
poorly sealed,
or
missing
Starter jet
clogged
Compression Low
:
Spark
plug loose
Cylinder
head not
suffiCiently tightened
down
Cylinder,
piston
worn
Piston
ring bad
(worn, weak, broken,
or sticking)
Piston ring/Jand clearance
excessive
Cylinder
head
gasket damaged
Cylinder
head warped
Cylinder base
gasket
damaged
Reed
valve
damaged
Cylinder
nut loose
Poor Running at Low
Speed:
Spark
weak:
Spark
plug dirty,
broken.
or
maladjusted
Spark
plug
cap or
high tension wiring
trouble
Spark plug
cap shorted
or
not in good
contact
Spark
plug incorrect
COl
unit trouble
Ignition
coil
trouble
Flywheel magneto damaged
Fuel/air
mixture
Incorrect:
Idle
adjusting screw
maladjusted
Slow
jet
or air
passage clogged
Air cleaner clogged, poorly
sealed,
or
missing
Starter plunger
stuck open
Fuel
level
too high or too low
Fue
l tank
air vent obstructed
Carburetor holder loose
Air
clea
ne
r duct
loose
Compresskm
low
:
Spark p lug loose
Cylinder
head not sufficiently tightened down
Cylinder. piston worn
Piston ring bad
(worn, weak,
broken,
or
sticking)
Piston
ring/land
clearance excessive
Cylinder head gasket damaged
Cylinder
head warped
Cylinder
base gasket damaged
Reed
valve
damaged
Cylinder
nut loose
KIPS
pons
stuck
open:
KIPS exhaust
valve stuck
open
(valve
seizure,
or
carbon
accumu lation)
KIPS exhaust
valves
assembled incorrectly
Exhaust advancer spring damaged
Exhaust valve operating rod seizure
Rod
(for KI
PS) seized in cylinder
Other:
COl
unit trouble
Transm
ission
oil
viscosity
too
high
Brake d ragging
Poor Running or No Power
at
High
Speed:
Firing
InCOl'Tect:
Spark
plug
dirty, damaged,
o
r
maladjusted
Spark
plug
cap
or high tension
wiring
damaged
Spark plug
cap shorted or
not in good contact
Spark
plug incorrect
COl unit trouble
Ignition
coil
trouble
Flywheel
magneto
damaged

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