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Troubleshooting
Possible Cause
Intake coupling cracked or clamps incorrectly tightened
Defective floating valve
Carburettor nozzles clogged
Fuel pump fault
Excessive oil consumption/Exhaust smoke
EXCESSIVE OIL CONSUMPTION/SMOKEY EXHAUST
Possible Cause
Worn valve guides
Worn valve oil guard
Oil leaks from the couplings or from the gaskets
Worn or broken piston rings or piston rings that have not been
fitted properly
Insufficient lubrication pressure
Possible Cause
By-Pass remains open
Oil pump with excessive clearance
Oil filter too dirty
Oil level too low
Engine tends to cut-off at full throttle
Possible Cause
Faulty fuel supply
Incorrect float level
Water in the carburettor
Maximum nozzle dirty - lean mixture
Engine tends to cut-off at idle
Possible Cause
Incorrect timing
Cut off device failure
Incorrect idle adjustment
Pressure too low at the end of compression
Faulty spark plug or incorrect ignition advance
The starter remains on
Minimum nozzle dirty
TROUBL - 52
Replace the intake coupling and check the clamps are tight-
Check the proper sliding of the float and the functioning of the
Dismantle, wash with solvent and dry with compressed air
Check and replace the gaskets or restore the coupling seal
Replace the piston cylinder unit or just the piston rings
POOR LUBRICATION PRESSURE
Check the By-Pass and replace if required. Carefully clean the
Perform the dimensional checks on the oil pump components
ENGINE STOP FULL THROTTLE
Check or replace the pump and the vacuum valve, check the
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
Wash the nozzle with solvent and dry with compressed air
ENGINE STOP IDLING
Time the system and check the timing system components
Check that the following parts work properly: valve; diaphragm;
spring; and that the air calibration elements are clean; check if
Check the thermal group seals and replace worn components
Replace the spark plug or check the ignition circuit components
Check: electric wiring, circuit not interrupted, mechanical
Wash the nozzle with solvent and dry with compressed air
X9 Evolution 125
Operation
ened
valve
Check the pump control device
Operation
Check and replace the head unit if required
Replace the valve oil guard
Operation
By-Pass area.
Replace the cartridge filter
Restore the level adding the recommended oil type
Operation
vacuum intake and the pipe sealing
the tank level with the carburettor inverted.
Empty the tank through the appropriate bleed nipple.
Operation
the sponge filter is clean too
Adjust using the rpm indicator
movement and power supply; replace if necessary
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