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ENGIN
E
LA
CKS POWER
1.
Drive Train Inspection
Raise
wheel off the ground and spin by
hand.
Does the wheel
spin
freely?
NO
-
.
Brake
dragging
•
Worn
or
damaged wheel bearing
•
Damaged
differential or final drive bearing
•
Faulty differential or final drive
YES
-
GO
TO
STEP 2.
2.
Tire Pressure Inspection
Check tire pressure.
Are
the
tire pressures
low?
YES
- . Faulty
tire valve
•
Punctured
tire
NO
-
GO
TO
STEP 3.
3. Engine Condition Inspection
Accelerate lig htly.
Does the engine
speed
increase?
NO
- .
Fuel/ai
r
mixture
too rich
or
lean
•
Clogged air cleaner
•
Restricted
fuel
flow
•
Clogged muffler
•
Restricted fuel tank b reather hose
YES
- GO TO
STEP
4
.
4.
Engine Condition Inspection
Accelerate or run
at high
speed.
Is there knocking
?
YES
_.
Worn piston and
cyl
inder
•
Use of
poor
qu
ality fuel
•
Excessive carbon
build-up
in combustion chamber
•
Ignition
timing too advance (Faulty
ECM)
•
Lean
fuel mixture
NO
- GO
TO
STEP 5_
5.
Ignition Timing Inspection
Check
the
ignition
timing.
Is the ignition timing correct?
NO
-
.
Faulty
engine control module (ECM)
•
Faulty
ignition pulse generator
YES
-
GO
TO
STEP 6.
6. Spark Plug Inspection
Remove and inspect spark plug.
Is the
spark
plug fouled
or
discolored?
YES
_
.
Plug
not serviced
frequently
enough
•
Incorrect
spark plug used
NO
- GO
TO
STEP 7.
TROUBLESHOOTING
27-3
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