VESPA 633844 IT Service Manual page 38

Maintenance
Air filter - clean
Air filter belt compartment - check
Engine oil - change
Valve clearance - check
Electrical system and battery - check
Coolant level - check
Brake fluid level - check
Engine oil - replacement
Brake pads - check condition and wear
Sliding block / variable speed rollers - change
Tyre pressure and wear - check
Vehicle and brake test - road test
Hub oil - change
Suspensions - check
Steering - Check
Checking the spark advance
The ignition advance is determined electronically
on the basis of parameters known by the control
unit. For this reason it is not possible to declare the
reference values based on the engine rpm. The
ignition timing value is detectable any time using
the diagnostic tester. It is possible to check wheth-
er the ignition advance determined by the system
does in fact correspond with the value actually ac-
tivated on the engine, by means of the strobo-
scopic light.
Proceed as follows:
- Remove the spark plug.
- Remove the plastic cover on the flywheel cover
shown in the photograph.
- Remove the transmission compartment air intake
cover shown in the photograph.
- Rotate the driving pulley fan using a screwdriver
until the reference marks between the flywheel
and flywheel cover coincide as shown in the pho-
tograph.
- Bring the reference mark onto the transmission
side between the fan and the transmission cover
as shown in the photograph.
- Refit the spark plug.
MAIN - 4
Action
Vespa GTV 250 i.e.