PIAGGIO Runner 125 - Excessive oil consumption;Exhaust smoke; Insufficient lubrication pressure; Engine tends to cut-off at full throttle; Engine tends to cut-off at idle

Possible Cause Operation
Battery flat Check the charge of the battery, if there are any sulphur marks,
replace and use the new battery following the instructions
shown in the chapter
Intake coupling cracked or clamps incorrectly tightened Replace the intake coupling and check the clamps are tight-
ened
Defective floating valve Check the proper sliding of the float and the functioning of the
valve
Carburettor nozzles clogged Dismantle, wash with solvent and dry with compressed air
Fuel pump fault Check the pump control device
Excessive oil consumption/Exhaust smoke
EXCESSIVE OIL CONSUMPTION/SMOKEY EXHAUST
Possible Cause Operation
Worn valve guides Check and replace the head unit if required
Worn valve oil guard Replace the valve oil guard
Oil leaks from the couplings or from the gaskets Check and replace the gaskets or restore the coupling seal
Worn or broken piston rings or piston rings that have not been
fitted properly
Replace the piston cylinder unit or just the piston rings
Insufficient lubrication pressure
LOW LUBRICATION PRESSURE
Possible Cause
Operation
By-Pass remains open Check the By-Pass and replace if required. Carefully clean the
By-Pass area.
Oil pump with excessive clearance Perform the dimensional checks on the oil pump components
Oil filter too dirty Replace the cartridge filter
Oil level too low Restore the level adding the recommended oil type
Engine tends to cut-off at full throttle
ENGINE STOP FULL THROTTLE
Possible Cause
Operation
Faulty fuel supply Check or replace the pump and the vacuum valve, check the
vacuum intake and the pipe sealing
Incorrect float level Restore the level in the tank by bending on the float the thrust-
ing reed of the petrol inlet rod so as to have the float parallel to
the tank level with the carburettor inverted.
Water in the carburettor Empty the tank through the appropriate bleed nipple.
Maximum nozzle dirty - lean mixture Wash the nozzle with solvent and dry with compressed air
Engine tends to cut-off at idle
ENGINE STOP IDLING
Possible Cause
Operation
Incorrect timing Time the system and check the timing system components
Cut off device failure Check that the following parts work properly: valve; diaphragm;
spring; and that the air calibration elements are clean; check if
the sponge filter is clean too
Incorrect idle adjustment Adjust using the rpm indicator
Pressure too low at the end of compression Check the thermal group seals and replace worn components
Faulty spark plug or incorrect ignition advance Replace the spark plug or check the ignition circuit components
The starter remains on Check: electric wiring, circuit not interrupted, mechanical
movement and power supply; replace if necessary
Troubleshooting Runner 125 - 200
TROUBL - 56