PIAGGIO Liberty 50 Catalyzed, Workshop Manual

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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
Fuel nozzles or cock clogged or dirty Dismantle, wash with solvent and dry with compressed air
Excess of encrustations in the combustion chamber Remove the encrustations
Lack of compression wear of the piston rings or cylinder Check the worn parts and replace them
Exhaust pipe clogged due to excessive encrustations Replace the exhaust pipe and check the carburation and mixer
timer
Air filter blocked or dirty Clean according to the procedure
Starter inefficient (stays on) Check the mechanical sliding, continuity of the circuit, the pres-
ence of power and electrical wiring
Clutch slipping Check the centrifugal brake shoe assembly and /or clutch bell
and replace if necessary
Defective mobile pulley sliding Check the parts, change the faulty parts and lubricate the driv-
en pulley using only Montblanc-Molibdenum Grease (dis.
498345) grease
Driving belt worn Replace
Carburettor nozzles clogged Dismantle, wash with solvent and dry with compressed air
Fuel filter on vacuum operated cock blocked Clean the cock filter
Roller wear; Presence of oil; Dirt Check the cap with filter is fitted to the transmission cover;
clean the speed variator, replace the rollers if worn out
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
Starting difficulties
DIFFICULTY STARTING
Possible Cause Operation
Carburettor nozzles clogged or dirty Dismantle, wash with solvent and dry with compressed air
Faulty fuel cock Check that, at ignition and with throttle untwisted, no petrol
flows out the delivery pipe; otherwise, replace the vacuum-op-
erated cock
Starter inefficient Check: electric wiring, circuit continuity, mechanical sliding and
power supply
Defective spark plug or with incorrect electrode gap Check and if necessary replace the spark plug and the elec-
trode gap
Flat battery Check the state of the battery. If it shows signs of sulphation
replace it and bring the new battery into service charging it for
eight hours at a current of 1/10 of the capacity of the battery
itself
Engine flooded Start the vehicle keeping the throttle fully open alternately mak-
ing the engine run for approx. five seconds and stopping for
other five seconds. If however it does not start, remove the
spark plug, the engine over with the throttle open being careful
Troubleshooting
Liberty 50 Catalyzed
TROUBL - 34