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TROUBLESHOOTING
ENGINE LACKS POWER
1. Raise
wheets
off
ground and
spin by hand
WHEEL SPINS
FREELY
j
2. Check
tire
pressure with tire
gauge
PRESSURE NORMAL
I
3. Try rapid
acceleration
from
low
to
second
ENGINE SPEED
lOWAED
WHEN CLUTCH
IS RELEASED
j
4.
lightly accelerate
engine
ENGINE
SPEED INCREASE
j
5.
Check
ignition timing
CORRECT
I
6.
Check
valve
clearance
CORRECT
j
7.
Test
cylinder compression
using
compression gauge
NORMAL
I
8.
Check carburetor for clogging
NOT
CLOGGED
j
9
.
Remove
spark plug
NOT FOULED OR DISCOLORED
I
19-2
Probable Cause
WHEEL DOES NOT
SP
IN
----~
.
(11
Brake dragging
FREELY
(2)
Worn
or
damaged wheel
bearing
(3)
Drive
chain
too tight
(4)
Rear axle nut
excessively tight-
ened
PRESSURE TOO L O W - - - - -
---
(1)
Punctured
tire and tube
(2)
Faulty
tire
valve
ENG
I
NE
SPEED
DOES N O T - - - -
-
(1) Clutch
sl
ipping
CHANGE WHEN
CLUTCH
(2)
Worn clutch disc/plate
IS
RELEASED
(3)
Warped clutch disc/plate
ENG
I
NE
SPEED
DOES N O T ' - - - - -
..
(1)
Carburetor choke closed
INCREASE
SUFFICIENTLY
(2)
Clogged
air
cleaner
(3)
Restricted fuel
flow
(4)
Clogged fuel tank breather
tube
(5)
Clogged muffler
INCORRECT'---- - - - -
--
..
(1) Faulty COl
unit
(2)
Faulty pulse
generator
f3)
Faulty alternator
INCORRECT--- - - - - -
-- -
(1) Improper
valve
adjustment
(2)
Worn
valve
seat
TOO
LOW'----------~-
(1) Valve
stuck
open
(2)
Worn
cylinder
and piston
rings
(3)
L
eaking
head gasket
(4)
I
mproper
valve
timing
(5)
Improperly adjusted
decompres-
sion
mechanism
CLOGGED
- - - - - - -
--
-
-
..
(1)
Carburetor
not
serviced
fre·
quently
enough
FOULED OR DISCOLOAED'
-
- -
---
(t)
Plug
.~.ot
serviced
frequently
enough
(2)
Use
of plug with
improper
heat
range
•
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