Checking The Valve Clearance; Headlight Adjustment - VESPA LX 4T USA Workshop Manual

LX 4T USA
If the reference is opposite the indicator on the
head, turn the crankshaft once more as the piston
must be at the TDC of the bursting phase.
N.B.
TIME THE TIMING SYSTEM UNIT AS DESCRIBED IN CHAP-
TER 6 IF IT IS NOT IN PHASE

Checking the valve clearance

- Remove the spark plug access cover, undo the
4 fixing screws indicated in the figure and remove
the tappet cover.
- To check valve clearance, centre the reference
marks of the timing system point as described
above.
- Use an adequate thickness gauge to check that
the clearance between the valve and the register
corresponds with the indicated values.
Should the valve clearance values, intake and
drainage respectively, be different from the ones
indicated below, adjust them by loosening the lock
nut and operate on the register with a screwdriver
as shown in the figure.
Characteristic
Intake (with cold engine)
0.10 mm
Drainage (with cold engine)
0.15 mm

Headlight adjustment

Proceed as follows:
1. Place the vehicle in running order and with the
tyres inflated to the prescribed pressure, on a flat
surface 10 m away from a white screen situated in
a shaded area, making sure that the longitudinal
axis of the scooter is perpendicular to the screen;
Maintenance
MAIN - 35