PIAGGIO MSS ZIP 100 4T Service Manual page 39

MSS ZIP 100 4T
Possible Cause
Air filter obstructed or dirty.
The starter remains on
Loose nozzles
Incorrect float level
Possible Cause
Tear or irregular functioning
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
Possible Cause
Wrong valve adjustment
incorrect valve sealing
Valve seat distorted
Worn or broken cylinder or piston rings
Possible Cause
The carburettor is dirty; vacuum operated cock failure
Excess of scales in the combustion chamber
Incorrect timing or worn timing system elements
Muffler obstructed
Automatic starter failure
Oil level exceeds maximum
Lack of compression: parts, cylinder and valves worn
Driving belt worn
Inefficient automatic transmission
Clutch slipping
Overheated valves
Wrong valve adjustment
Valve seat distorted
EXCESSIVE FUEL CONSUMPTION
Dismantle the sponge, wash with water and shampoo, then
soak it in a mixture of 50% petrol and 50% Selenia Air Filter Oil,
Check that the starter runs correctly and it is properly powered
Check the maximum and minimum nozzles are adequately
Restore the correct level in the chamber (the float must be par-
allel to the upper cover contact plane, that is the throttle valve
F
AULTY CLUTCH
Check that there is no grease on the masses. Check that the
clutch masses' contact surface with the clutch bell is mainly in
the middle with equivalent specifications on the three masses.
Check that the clutch bell is not scored or worn abnormally
LOW COMPRESSION
Remove the head and the valves, grind the seats, descale the
Replace the piston cylinder assembly or the piston rings
POOR PERFORMANCE
Dismantle, wash with solvent and dry with compressed air or
Descale the cylinder, the piston, the head and the valves
Check: mechanical movement, electric connection and fuel
Check the rollers and the pulley movement, replace the dam-
aged parts and lubricate the driven pulley moveable guide with
Check the clutch system and/or the bell and replace if neces-
Remove the head and the valves, grind or replace the valves
Operation
then allow to drip dry. Wring out water manually without
squeezing and reassemble
fixed in their fittings
membrane cover)
Operation
Operation
Adjust the valve clearance properly
valve heads and, if necessary, replace any faulty part.
Replace the head assembly
Operation
replace
Time the system again or replace the worn parts
Replace
supply, replace if required.
Check for causes and fill to reach the correct level
Replace the worn parts
Replace
Montblanc Molybdenum Grease
sary
Adjust the valve clearance properly
Replace the head unit
Troubleshooting
TROUBL - 39