PIAGGIO X9 Service Station Manual page 98

X9 125-180 ce 4T4V
SYMTOM
Rich mixture
Weak mixture
Low compression
Excessive oil con-
sumption / excessive
smoke from exhaust
pipe
Insufficient lubrication
pressure
POSSIBLE CAUSE
Calibrated air holes on carburettor obstructed
Float valve faulty
Level in float bowl too high
Automatic choke stays activated
Air filter dirty
Carburettor jets clogged
Float valve faulty
Level in float bowl too low
Tank breather clogged
Feed pipes choked or throttled
Intake manifold cracked or clamps poorly
tightened
Incorrect valve adjustment
Valves overheated
Valve seats distorted
Cylinder worn. Piston rings worn or broken.
Piston rings worn or broken or improperly
fitted
Oil leaks from joints or gaskets
Worn oil retainer
Valve guides worn
Oil level too low
Oil filter excessively dirty
Oil pump play excessive
By-pass stays open
Troubleshooting
INTERVENTION
Remove, wash in solvent and dry with com-
pressed air
Check float and valve operation
Restore the level in the float chamber by
aending the fuel inlet needle thrust blade on
the float so that the float is parallel with the
chamber surface when the carburettor is in
an upside-down position.
Check the mechanical sliding and the electri-
cal connection and ensure that power is
supplied. If necessary replace.
Remove the sponge, wash it in water and
shampoo, and then soak it in a 50 percent
mixture of petrol and a specific oil (Selenia Air
Filter Oil). Squeeze the sponge between the
hands without twisting, allow it to drip and
then replace it.
Remove, wash in solvent and dry with com-
pressed air.
Check the sliding of the float and the opera-
tion of the valve.
Restore the level in the float chamber by
bending the fuel inlet needle thrust blade on
the float so that the float is parallel with the
chamber surface when the carburettor is in
an upside-down position.
Restore proper tank aeration.
Restore proper fuel flow.
Replace the intake connection and check for
any abnormal air inleakage.
Adjust valve clearance.
Remove the cylinder head and the valves,
then grind or replace the valves.
Replace head assembly.
Replace cylinder-piston assembly or piston
rings.
Replace cylinder-piston assembly or piston
rings only.
Check and replace the gaskets or restore the
seal of the joints
Replace valve oil retainer.
Check and if necessary replace head assem-
bly.
Top up with recommended oil type (Selenia
HI Scooter 4 Tech).
Replace the cartridge filter.
Carry out the dimensional checks on the oil
pump components.
Check the by-pass and if necessary replace
it. Carefully clean the by-pass area.
1st Update to part no. 594599X9 125-180 CC4T4V 3 - 45
Primera actualización dib. 594599 X9 125-180 cc 4T 4V
1 • Atualização Des. 594599 X9 125-180 ce 4T 4V