Engine Tends To Cut-Off At Idle; Excessive Exhaust Noise; High Fuel Consumption; Sas Malfunctions - PIAGGIO MSS ZIP 100 4T Service Manual

Troubleshooting

Engine tends to cut-off at idle

Possible Cause
Wrong idling adjustment
Spark plug defective or faulty
The starter remains activated
Minimum jet dirty
Electronic ignition circuit failure
Pressure too low at the end of compression
Incorrect timing

Excessive exhaust noise

Possible Cause
Depression intake pipe of the secondary air device disconnec-
ted or dented
Reed valve of the secondary air device does not close correctly
and wears out the rubber coupling between the device and the
head pipe

High fuel consumption

Possible Cause
Float level
Loose nozzles
Starter inefficient
Air filter blocked or dirty.

SAS malfunctions

Possible Cause
Depression intake pipe of the secondary air device disconnec-
ted or dented
Reed valve of the secondary air device does not close correctly
and wears out the rubber coupling between the device and the
head pipe
TROUBL - 42
THE ENGINE TENDS TO STOP AT IDLE SPEED
EXCESSIVE EXHAUST NOISE
HIGH FUEL CONSUMPTION
A
NOMALIES IN THE SECONDARY AIR DEVICE
Operation
Correctly adjust the engine idling and check the level of the
C.O.
Replace the spark plug with one with the specified degree and
check the plug gap
Check that the automatic starter works and moves correctly
and it is properly powered.
Remove the carburettor, wash with solvent and dry with com-
pressed air
Use a stroboscopic light and an rpm indicator to check for cor-
rect ignition advance and make sure the flywheel is correctly
keyed
Check the thermal group seals and replace worn components;
check and restore the correct valve clearance.
Time the system and check the timing system components
Operation
Replace the pipe
Replace the device and the coupling
Operation
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.
Check the maximum and minimum nozzles are adequately
fixed in their fittings
Check: electric wiring, circuit continuity, mechanical sliding and
power supply
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.
Operation
Replace the pipe
Replace the device and the coupling
MSS ZIP 100 4T