PIAGGIO XEVO 125 Euro 3, Service Station Manual, Page: 52 / 289

This section makes it possible to find what solutions to apply when troubleshooting.
For each breakdown, a list of the possible causes and respective interventions is given.
Engine
Poor performance
POOR PERFORMANCE
Possible Cause Operation
The carburettor is dirty; fuel pump or vacuum valve
damaged
Remove, wash with solvent and dry with com-
pressed air or replace
Excess of encrustations in the combustion cham-
ber
Descale the cylinder, the piston, the head and the
valves
Incorrect timing or worn timing system elements Time the system again or replace the worn parts
Muffler obstructed Replace
Air filter blocked or dirty. Remove the sponge, wash with water and car
shampoo, then soak it in a mixture of 50% petrol
and 50% specific oil. Press with your hand without
squeezing, allow it to drip dry and refit.
Automatic starter failure Check: mechanical movement, electric connec-
tion and fuel supply, replace if required.
Oil level exceeds maximum Check for causes and fill to reach the correct level
Lack of compression: parts, cylinder and valves
worn
Replace the worn parts
Transmission belt worn Replace
Inefficient automatic transmission Check the rollers, the pulley movement and make
sure the drive belt is in good conditions; replace
the damaged parts and lubricate the moveable
driven pulley with specific grease.
Clutch slipping Check the clutch system and/or the bell and re-
place if necessary
Overheated valves Remove the head and the valves, grind or replace
the valves
Wrong valve adjustment Adjust the valve clearance properly
Valve seat distorted Replace the head assembly
Defective floating valve Check the proper sliding of the float and the func-
tioning of the valve
Rear wheel spins at idle
Starting difficulties
DIFFICULT STARTING
Possible Cause Operation
Altered fuel characteristics Drain off the fuel no longer up to standard; then,
refill
Rpm too low at start-up or engine and start-up
system damaged
Check the starter motor, the system and the torque
limiter
Troubleshooting
XEVO 125 Euro 3
TROUBL - 2