Excessive Oil Consumption/Exhaust Smoke; Insufficient Lubrication Pressure; Engine Tends To Cut-Off At Idle; Engine Tends To Cut Out At Full Throttle - PIAGGIO MSS Fly 50 4T Workshop Manual

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Troubleshooting
Possible Cause
Automatic starter failure
Air filter blocked or dirty.
Faulty spark plug or incorrect ignition advance
The carburettor is dirty; vacuum operated cock failure
Battery flat
Intake coupling cracked or clamps incorrectly tightened
Defective floating valve
Carburettor nozzles clogged

Excessive oil consumption/Exhaust smoke

EXCESSIVE OIL CONSUMPTION / EXHAUST SMOKE
Possible Cause
Worn valve oil guard
Oil leaks from the couplings or from the gaskets
Worn or broken piston rings or piston rings that have not been
fitted properly
Worn valve seat

Insufficient lubrication pressure

Possible Cause
By-Pass remains open
Oil pump with excessive clearance
Oil filter too dirty
Oil level too low
Engine tends to cut-off at full throttle

ENGINE TENDS TO CUT OUT AT FULL THROTTLE

Possible Cause
DEFECTIVE CIRCUIT OF FEEDING
Incorrect float level
Water in the carburettor
Maximum nozzle dirty - lean mixture

Engine tends to cut-off at idle

Possible Cause
Incorrect timing
TROUBL - 42
Replace the spark plug or check the ignition circuit components
Check the charge of the battery, if there are any sulphur marks,
Check the proper sliding of the float and the functioning of the
POOR LUBRICATION PRESSURE
Check the By-Pass and replace if required. Carefully clean the
Perform the dimensional checks on the oil pump components
Restore the level using the recommended oil type (Selenia HI
Check and possibly replace the automatic vacuum tap, check
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
ENGINE TENDS TO CUT-OFF AT IDLE
Operation
Check: mechanical movement, electric connection and fuel
supply, replace if required.
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.
Dismantle, wash with solvent and dry with compressed air or
replace
replace and use the new battery following the instructions
shown in the chapter
Replace the intake coupling and check the clamps are tight-
ened
valve
Dismantle, wash with solvent and dry with compressed air
Operation
Replace the valve oil guard
Check and replace the gaskets or restore the coupling seal
Replace the piston cylinder unit or just the piston rings
Check and if necessary replace head assembly
Operation
By-Pass area.
Replace the cartridge filter
Scooter 4 Tech)
Operation
the vacuum intake and the conduit seal
the tank level with the carburettor inverted.
Empty the tank through the appropriate bleed nipple.
Wash the nozzle with solvent and dry with compressed air
Operation
Time the system and check the timing system components
MSS Fly 50 4T

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