VESPA LX 50 Specifications download pdf (Page 39)

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

Battery flat 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

Vespa LX 50 Troubleshooting

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VESPA LX 50 Specifications Page 39

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