53411 Suzuki RM125B

TROUBLESHOOTING 3-3

Complaint	Possible Cause	Remedy
Engine runs poorly in	Exhaust valve maladjustment	Adjust
Iow speed rangę	Wide spark pług gap	Adjust or replace
	Carburetor air screw maladjustment	Adjust
	Incorrect carburetor fuel level	Adjust
	Improper jet needle size	Replace
	Incorrect ignition timing	Adjust
	CDI unit malfunction	Replace
	Ignition coil damage	Replace
	Magneto malfunction	Replace
	Magneto short Circuit	Replace
Engine runs poorly in	Narrow spark pług gap	Adjust or replace
high speed rangę	Incorrect carburetor fuel level	Adjust
	Retarded ignition timing	Adjust
	CDI unit malfunction	Replace
	Ignition coil damage	Replace
	Air cleaner element clogged	Clean or replace
	Mag neto short circu it \ V • ^	Replace
	Exhaust pipę cracked \ \ \ \ / >	Replace
	Exhaust valve malfunction...-^x'._. \ \ \ / \ * •. \ \ V"	Clean, adjust or
	% «.•' ”, • V \ ,/ V r' \ \ V' / \	replace
	Piston ring stuck- \ v \ \ ^v"	Replace
Exhaust valve does	Carbon depostts ojt ekhauśt va!ve	Clean
not work	Exhaust valve damśge \ ^;	Replace
	Governe.r damdge, >	Replace
(	Exhaust yalve shaft damage	Replace
v	Valve spring damage	Replace
	Bchaust valve breather hose clogged	Clean
Spark pług does not	Ignition coil malfunction	Replace
ignite	Spark pług malfunction	Replace
	Magneto malfunction	Replace
	CDI unit malfunction	Replace
	Wide spark pług gap	Adjust
	Engine stop switch malfunction	Repair or replace
Carbon deposits on	Too rich air/fuel mixture	Adjust
spark pług porcelain	Too rich oil/gasoline mixture	Adjust
	Improper spark pług heat rangę	Replace
Spark pług electrode	Improper spark pług heat rangę	Replace
damage	Overheating	CZ/^3-4
	Incorrect ignition timing	Adjust
	Loose spark pług	Tighten
	Too lean air/fuel mixture	Adjust