PIAGGIO MSS Fly 50 4T User Manual

This section makes it possible to find the solutions to use in troubleshooting.
For each breakdown, a list of the possible causes and respective interventions is given.
Engine
Poor performance
POOR PERFORMANCE
Possible Cause Operation
The carburettor is dirty; vacuum operated cock failure Dismantle, wash with solvent and dry with compressed air or
replace
Excess of encrustations in the combustion chamber Descale the cylinder, the piston, the head and the valves
Incorrect timing or worn timing system elements Time the system again or replace the worn parts
Muffler obstructed Replace
Automatic starter failure Check: mechanical movement, electric connection and fuel
supply, replace if required.
Oil level exceeds maximum Check for causes and fill to reach the correct level
Lack of compression: parts, cylinder and valves worn Replace the worn parts
Transmission belt worn Replace
Inefficient automatic transmission Check the rollers and the pulley movement, replace the dam-
aged parts and lubricate the driven pulley moveable guide with
Montblanc Molybdenum Grease
Clutch slipping Check the clutch system and/or the bell and replace if neces-
sary
Overheated valves Remove the head and the valves, grind or replace the valves
Wrong valve adjustment Adjust the valve clearance properly
Valve seat distorted Replace the head assembly
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.
Defective floating valve Check the proper sliding of the float and the functioning of the
valve
Rear wheel spins at idle
REAR WHEEL
Possible Cause
Operation
Idling rpm too high Check the idling speed and, if necessary, adjust the C.O.
Clutch fault Check the spring/friction mass and the clutch bell
Air filter housing not sealed Correctly refit the filter housing and replace it if it is damaged
Purifier-carburettor fitting damaged Replace
Starting difficulties
STARTING PROBLEMS
Possible Cause
Operation
Altered fuel characteristics Drain off the fuel no longer up to standard; then, refill
Rpm too low at start-up or engine and start-up system dam-
aged
Check the starter motor and the system.
Incorrect valve sealing or valve adjustment Inspect the head and/or restore the correct clearance
- Engine flooded. Try starting-up with the throttle fully open. If the engine fails to
start, remove the spark plug, dry it and before refitting, make
the motor turn so as to expel the fuel excess taking care to
connect the cap to the spark plug, and this in turn to the ground.
If the fuel tank is empty, refuel and start up.
MSS Fly 50 4T Troubleshooting
TROUBL - 41

PIAGGIO MSS Fly 50 4T Specifications

General

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