Diagnosis and troubleshooting of motorcycle Aprilia RS125/3 (1998-2005)

Engine troubleshooting information
TroubleSymptom and possible causesRemedy Engine does not start or is difficult to startLow compression Cylinder or piston rings exceedingly worn.Replace. Piston ring sticking in its groove.Repair or replace. Crankcase, cylinder or cylinder head...

Carburetor troubleshooting information
TroubleSymptom and possible causesRemedy Difficulties on startingStarter jet obstructed.Clean. Starter duct obstructed.Clean. Air leaking past the gasket between cold-start body and carburetor.Check and tighten. Cold-start shutter is...

Radiator troubleshooting information
TroubleSymptom and possible causesRemedy Engine overheatsCoolant 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...

Electrical system troubleshooting information
TroubleSymptom and possible causesRemedy Spark plugs develop exceeding carbon buildup too quicklyCarburetion too rich.Adjust carburetor. Idling speed set too high.Adjust carburetor. Fuel does not meet specification.Change fuel. Air cleaner...

Battery troubleshooting information
TroubleSymptom and possible causesRemedy Battery runs flat quicklyCharge system faulty.Check generator, regulator/rectifier, circuit connections and rectify to obtain proper charge Battery was overcharged and battery cells lost much of their active...

Brakes troubleshooting information
TroubleSymptom and possible causesRemedy Loss of brakingBrake hydraulic system leaking.Repair or replace. Brake pads worn.Replace. Contact surfaces of brake pads contaminated with oil.Replace. Brake discs worn.Replace. Air in the hydraulic...

Chassis troubleshooting information
TroubleSymptom and possible causesRemedy Hard steeringSteering adjusting ring nut overtightened.Adjust. Steering bearing damaged.Replace. Steering stem distorted.Replace. Tyre underinflated.Adjust. Handlebars shakeUneven front fork settings.Adjust....