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TROUBLESHOOTING
ENGINE LACKS
POWER
1
.
Raise
wheels
off
ihe
ground and
spin
by hand
Possible
Cause
Wheels
Do
Not
Spin
Brake dragging
Freely
•
Worn
or
damaged
wheel
bearing
Wheel
Spins
Freely
t
2
.
Check
tire
pressure
•
Pressure
Low
3.
4.
5.
Pressure
Normal
Accelerate
rapidly
from low
to
second
—
»
Engine
Speed Lowered
When
Clutch
Is
Released
1
Accelorate
lightly
•
Engine
Speed
Increase
*
Check
ignition
timing
Engine
Speed Not Changed
When
Clutch
Is
Released
Engino
Speod Does
Not
Increase
Incorrect
Correct
I
6.
Test cylinder
compression
—
—
Incorrect
Normal
t
7.
Check
carburetor
for
clogging
'»
Clogged
~
~
~
»«
Not
clogging
t
8.
Remove
spark plug
1
»
Fouled
Or
Discolored
—
Not fouled
Or
Discolored
l
9.
Check
oil level
and
condition
~
—•
Incorrect
Correct
l
10.
Remove
cylinder
head
cover
and
•» Valve Train
Not
Lubricated
inspect lubrication
Properly
Faulty
tire
valve
Puncture
Clutch
slipping
Worn
clutch discs/plates
Warped
clutch discs/plates
Weak
clutch spring
Starting
enrichment
valve
ON
Clogged
air
cleaner
Restricted fuel
flow
Clogged
muffler
Pinched
fuel
tank breather
Faulty
ignition
control
module
Faulty
ignition
pulse generator
Valve
stuck
open
Worn
cylinder
and
piston rings
Leaking/damaged head
gasket
Improper
valve timing
Carburetor not serviced
frequently
enough
Plug not serviced frequently
enough
Spark plug
is
incorrect
heat range
Oil
level
too high
Oil
level
too
low
Contaminated
oil
Clogged
oil
passage
Clogged
oil
control
orifice
Valve Train Lubricated Properly
I
20-2
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