Possible Cause Operation
Air filter dirty Dismantle the sponge, wash with water and shampoo, then
soak it in a mixture of 50% petrol and 50% Selenia Air Filter Oil,
then allow to drip dry. Wring out water manually without
squeezing and reassemble.
EXCESSIVE OIL CONSUMPTION/SMOKEY EXHAUST
Possible Cause Operation
Worn or broken cylinder or piston rings Replace the piston cylinder assembly or the piston rings
Oil leaks from the couplings or from the gaskets Check and replace the gaskets or restore the coupling seal
Worn valve oil guard Replace the valve oil guard
Worn valve guides Check and replace the head unit if required
Insufficient lubrication pressure
POOR OR LEAN MIX
Possible Cause Operation
Carburettor nozzles clogged Dismantle, wash with solvent and dry with compressed air
Defective floating valve Check the proper sliding of the float and the functioning of the
valve
Level in chamber too low Restore the correct level in the chamber (the float must be par-
allel to the upper cover contact plane, that is the throttle valve
membrane cover)
Tank breather hole obstructed Restore the proper reservoir aeration
Fuel filter on vacuum operated cock blocked Clean the cock filter
Fuel supply pipes choked or clogged Restore the adequate fuel supply
Intake joint cracked or with a bad seal Replace intake joint and check for correct sealing on the head
Air filter housing not sealed Correctly refit the filter housing and replace it if it is damaged
Purifier-carburettor fitting damaged Replace
POOR LUBRICATION PRESSURE
Possible Cause
Operation
By-Pass remains open Check the By-Pass and replace if required. Carefully clean the
By-Pass area.
Oil pump with excessive clearance Perform the dimensional checks on the oil pump components
Oil filter too dirty Replace the cartridge filter
Oil level too low Restore the level using the recommended oil type (Selenia HI
Scooter 4 Tech)
Engine tends to cut-off at full throttle
THE MOTOR TENDS TO STOP AT MAXIMUM THROTTLE
Possible Cause
Operation
Maximum jet clogged Remove the carburettor, wash with solvent and dry with com-
pressed air
Incorrect ignition advance Use a stroboscopic light to check ignition advance and the fly-
wheel correct keying
Water or condensation in the carburettor chamber Remove the chamber, wash with solvent and dry with com-
pressed air or empty the tank through the appropriate bleed
screw
Air filter obstructed or dirty. Dismantle the sponge, wash with water and shampoo, then
soak it in a mixture of 50% petrol and 50% Selenia Air Filter Oil,
then allow to drip dry. Wring out water manually without
squeezing and reassemble
Incorrect float level Check and restore the correct fuel level in the chamber
MSS ZIP 100 4T Troubleshooting
TROUBL - 41
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