Suzuki RM250 Owner's Service Manual page 31

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TROUBLESHOOTING
3-2
Complaint
Possible
Cause
Remedy
Engine
runs
poorly
Wide spark
plug gap
Adjust
or
replace
in low
speed range
Carburetor
air
screw
maladjustment
Adjust
Incorrect
carburetor
fuel level
Adjust
Improper
jet needle
size
Adjust
In
correct ignition
timing
Adjust
CO
l
unit malfunction
Replace
Ignition
coil
damage
Replace
Magneto
malfunction
Replace
Magneto
short circuit
Replace
Engine
runs
poorly
Narrow spark
plug
gap
Adjust
or
replac
e
in
high
speed range
Incorrect carburetor fuel
level
Adjust
Retarded ignition timing
Adjust
COl
unit
malfunction
Replace
Ignition
coi
l
damage
Replace
Air
cleaner
element
clogged
Clean
or replace
Magneto
short
circuit
Replace
Exhaust pipe
cracked
Replace
E)(haust
valve
malfunction
Clean
.
adjust or
replace
Piston
ring stuck
Replace
Engine
speed
does
Too high
engine idle speed
Adjust
no
t
return smooth ly
Exhaust valve does
Ca rbon
deposits
on exhaust valve
Clean
not
work
Exhaust
valve damage
Replace
Governer damage
Replace
Exhaust
valve shaft damage
Replace
Valve spring
damage
Replace
Spark plug does
Ignition
coil malfunction
Replace
not
ignite
Spark
plug malfunction
Replace
Magneto
malfunction
Replace
COl
unit malfunction
Replace
Wide spark
plug gap
Adjust
Engine kill
switch
malfunction
Repair or replace
Carbon
deposits
on
Too
rich
air/fuel
mixtu re
Adjust
spa
rk
plug porcelain
Too
rich oil/gasoline
mixture
Adjust
Improper spark plug
heat range
Replace
Spark
plug
Improper
spark
plug
heat
range
Replace
electrode
damage
Overheating
CT
3-3
Incorrect
ignition
timing
Adjust
Loose
spark
plug
Tighten
Too
lean ai
r/fuel mixture
Adjust
I

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