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Fuel/air
mixture incorrect:
Main
jet
clogged or wrong
size
Jet
needle or needle jet worn
Jet
needle clip
in
wrong
position
Fuel level too high
or
too low
Air jet or air passage clogged
Air cleaner clogged. poorty
sea led.
or
missing
Starter
plunger
stuck open
Fuel
to
carburetor insufficient
Water or foreign matter
in
fuel
Fuel to carburetor insufficient
Water
or
foreign matter
in
fuel
Fuel tank air
vent
obstructed
Carburetor
holder loose
Air
cleaner duct
loose
Fuel tap clogged
Fuel
line clogged
Compression
low
:
Spa
rk
plug loose
Cylinder
head not
sufficientl
y
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
Cyl
inder nut
loose
Engine rpm will not
rise
properly
:
Starter
plunger stuck
open
Fuel level
too
high or
too low
Main
jet
clogged
Throttle valve
does not fully open
Air cleaner
clogged
Muffler clogged
Water or
foreig
n
matter
in
fuel
Cylinder
exhaust
port
clogged
Brake dragging
Clutch slipping
Overheating
Transm
ission
oil leve
l
too
high
Transmission oil
viscosity
too
high
Crankshaft
bearing worn
or
damaged
KIPS ports stuck
closed
:
KIPS exhaust
valves stuck closed
(valve
seiZUre,
or
carbon
accumulation)
KIPS exhaust
valves
assembled
incorrectly
KIPS ports clogged (carbon accumulation)
Exhaust valve
operating
rod
seizu
re
ROD (for KIPS)
seized in
cyl
inder
Knocking
:
Carbon built
up
in
combustion
cha
mber
Fuel
poor
qua
lity
or
incorrect
Spark
plug
incorrect
cor un
it
trouble
Overheating:
Firing
incorrect:
Spark
plug
dirty, broken.
or
maladjusted
Spark plug incorrect
COl unit
trouble
Fue
llair
mixture
incorrect:
APPENDIX 14-3
Main jet
clogged or
wrong
size
Fuel
level
in
carburetor
fl
oat
bowl
too low
Ca
rbu
retor
holder
loose
Air cleaner
poo
rl
y sea
led
.
or mi
ssing
Air deaner duct poorly
sea led
Air cleaner
dogged
Compression high
:
Carbon
built up in
combustion chamber
Engine
load faulty
:
Brake dragging
Clutch
slipping
Transmission
oi
l
level
too
high
Transmission
oi
l
viscosity
too
high
Lubrication
inadequate
:
Transmission
oil
level
too low
Transmission oil poor
qua
lity or incorrect
Coolant
incorrect:
Coolant
level
too
low
Coot
ant deteriorated
Cooling
system component
Incorrect
:
Radiator dogged
Radiator
cap
trouble
Water
pump
not
rotating
Clutch Operation Faulty:
Clutch
slipping
:
No
clutch lever play
Clutch
cable maladjusted
Clutch inner cable catching
Friction
plate
worn
or warped
Steel
plate worn
or
warped
Clutch spri
ng
broken
or
weak
Clutch release
mechanism trouble
Clutch
hub or housing
unevenly
worn
Clutch
not disengaging properly
:
Clutch lever play
excessive
Clutch plate warped
or
too
rough
Clutch spring
tension
uneven
Transmi ssion
oil
deteriorated
Transmission
oil viSCOS ity
too
high
Transmission
oi
l
level too high
Clutch housing
frozen
on
drive shaft
Clutch
release
mecha
nism
trouble
Gear Shifting
Faulty:
Does
n't go Into
gear;
shift
pedal does 't return
:
Clutch not di
sengaging
Shift
fork bent or
seized
Gear
stuck
on the
shaft
Gear
positioning
lever
binding
Shift
return
spri ng
weak
or
broken
Shift
return
spring
pin
loose
Shift
mechanism arm
spring
broken
Shift
mechanism arm broken
Shift
drum broken

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