Checking The End Compression Pressure - PIAGGIO 633234 Workshop Manual

X9 Evolution 500
- Turn the headlight on, switch on the dipped beam
and check that the horizontal limit line between the
dark zone and the illuminated zone does not fall
above the horizontal line traced on the screen.
- Adjust the screw located under the front shield to
change the headlight inclination and the light beam
height.

Checking the end compression pressure

- With the engine cold remove the sparkplug cap.
- Remove the sparkplug.
- Fit a compression testing pressure gauge in the sparkplug seat with a 10 mm sparkplug fitting tightened
to the correct torque.
- With the switch on "ON" wait a few seconds and then disconnect the rpm-timing sensor to disable
operation of the injector and sparkplug.
- Run the engine using the starter motor and with the throttle body fully open, until the reading on the
pressure gauge is stable.
- If the pressure is greater than XX - XX, remove the device and reassemble the vehicle.
- If pressure values lower than those indicated are measured, check the engine rpm used for the test;
if under 450 rpm, check the starter system.
When the compression end pressure is under the norm, remove the fitting from the pressure gauge and
pour a few cc of oil in the combustion chamber, rotate the engine (preferably by hand) to lubricate the
cylinder.
Repeat the pressure test:
if the new values are still low check the valve seals.
Higher pressure values of a new engine indicate poor sealing of the parts.
Locking torques (N*m)
Spark plug 12 ÷ 14
Maintenance
MAIN - 47