57
Table of engine troubleshooting
Problem
Cause
Remedy
•
Eng
in
e
c
an
no
t
be
s
tar
te
d or
sta
lls
su
dd
e
n
ly
Sparking
normal in high
voltage cable
and no
sparking in
spark plug
•
Oil stained spark
plug
•
Broken spark plug
magnetic core or
broken electrode
•
Carbon deposit in
spark plug
electrode
•
Incorrect spark
plug gap
•
Remove, clean and
dry it
•
Replace spark plug
•
Clean out carbon
deposit
•
Adjust the gap.
Normal
sparking to
spark plug,
poor cylinder
compression
•
Leaking cylinder
head gasket
•
Loose spark plug
•
Seized piston ring
•
Excessively worn
piston or broken
piston ring
•
Serious cylinder
wearing
•
Leaking intake pipe
•
Damaged
crankshaft sealing
•
Tighten screw or
replace gasket
•
Tighten spark plug
•
Clean off carbon
deposit in piston
ring and ring groove
•
Replace piston and
piston ring
•
Replace cylinder
body
•
Tighten or replace
rubber ring
•
Replace sealing
Summary of Contents for Two Fifty 250 cc
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