TROUBLESHOOTING INFORMATION
RS 125
9.1.2. CARBURETOR
Trouble Symptom and possible causes Remedy
Starter jet obstructed. Clean.
Starter duct obstructed. Clean.
Air leaking past the gasket between cold-start body and
carburetor.
Check and tighten.
Difficulties on starting
Cold-start shutter is malfunctioning. Repair.
Idle jet obstructed or loose. Check and clean..
Air leaking past the S.I.P.C. tube of carburetor or cold-start
device.
Check.
Idle outlet or by-pass hole obstructed. Check and clean.
Erratic operation at idling
speed or in the low
speed range
Cold-start shutter does not close fully. Check and adjust.
Main jet obstructed. Check and clean.
Build-up sticking to tapered needle. Check and clean.
Throttle valve malfunctioning. Check throttle valve op-
eration.
Erratic operation in the
mid-to-high speed range
Filter obstructed. Inspect and clean.
Needle valve worn or damaged. Replace.
Float is malfunctioning. Check and adjust.
Debris build-up on needle valve. Clean.
Fuel level too high or too low. Adjust float height.
Carburetor breather hose obstructed. Clean.
Erratic overflow and fuel
level
Needle valve spring broken. . Replace
9.1.3. RADIATOR
Trouble Symptom and possible causes Remedy
Coolant insufficient. Top up.
Radiator fins obstructed by dirt or debris. Clean.
Thermostat faulty, jammed in the closed position. Replace.
Coolant passages obstructed. Clean.
Air in the cooling circuit. Bleed the circuit.
Coolant pump faulty. Replace.
Engine overheats
Coolant used does not meet specification. Change coolant.
Thermostat faulty, jammed in the fully open position. Replace.
Engine will not warm up
to regular operating tem-
perature
Very low ambient temperature. Fit cowl to radiator.
9 - 5
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