PIAGGIO MSS Fly 50 4T User Manual

Possible Cause Operation
Automatic starter failure Check: mechanical movement, electric connection and fuel
supply, replace if required.
Air filter blocked or dirty. Dismantle the sponge, wash with water and shampoo, then
soak it in a mixture of 50% petrol and 50% of specific oil (Se-
lenia Air Filter Oil), then hand dry without squeezing, allow to
drip dry and then reassemble.
Faulty spark plug or incorrect ignition advance Replace the spark plug or check the ignition circuit components
The carburettor is dirty; vacuum operated cock failure Dismantle, wash with solvent and dry with compressed air or
replace
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
Excessive oil consumption/Exhaust smoke
EXCESSIVE OIL CONSUMPTION / EXHAUST SMOKE
Possible Cause Operation
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
Worn valve seat Check and if necessary replace head assembly
Insufficient lubrication pressure
POOR 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 using the recommended oil type (Selenia HI
Scooter 4 Tech)
Engine tends to cut-off at full throttle
ENGINE TENDS TO CUT OUT AT FULL THROTTLE
Possible Cause
Operation
DEFECTIVE CIRCUIT OF FEEDING Check and possibly replace the automatic vacuum tap, check
the vacuum intake and the conduit seal
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 TENDS TO CUT-OFF AT IDLE
Possible Cause
Operation
Incorrect timing Time the system and check the timing system components
Troubleshooting MSS Fly 50 4T
TROUBL - 42

PIAGGIO MSS Fly 50 4T Specifications

General

Brand	PIAGGIO
Model	MSS Fly 50 4T
Category	Scooter
Language	English