VESPA 633844 IT, Service Manual

Page: 45 / 308

Checking the ignition timing
-Remove the plastic cap on the flywheel cover
-Turn the flywheel until the reference mark « T » on
the rotor matches the reference mark on the fly-
wheel cover as shown in the figure (TDC). Make
sure that the 4V reference point on the camshaft
control pulley is aligned with the reference point on
the head as shown in the second figure. If the ref-
erence is opposite the indicator on the head, turn
the crankshaft once more.
For the use of this reference mark, remove the
spark plug and turn the engine in the direction that
is the reverse of the normal direction using a cal-
liper spanner applied to the camshaft command
pulley casing.
Cooling system
Introduction of the engine coolant.
The fluid level must checked every 10,000 kilome-
tres with a cold engine, in the way shown below:
Place the scooter on its centre stand and on flat
ground.
- Undo the screw shown in the figure and remove
the expansion tank cap on RHS.
- Top up if the fluid level is near or below the MIN
level edge. The liquid level must always be be-
tween the MIN and MAX level.
-The coolant consists of an ethylene glycol and
corrosion inhibitor based 50% demineralised wa-
ter- antifreeze solution mix.
CAUTION
DO NOT EXCEED THE MAX. LEVEL WHEN
FILLING SO AS TO AVOID THE COOLANT ES-
CAPING FROM THE EXPANSION TANK WHEN
THE vehicle IS IN USE.
Vespa GTV 250 i.e.
Maintenance
MAIN - 11