1. Remove the threaded plug which is at the driving shaft level and fit a suitable timing chart.
2. Fit an indicator on one of the screws that secure the cover.
3. Bring the piston of the vertical cylinder to T.D.C. of the compression stroke and set the
indicator at "0" on the timing chart.
4. Rotate the driving shaft anti clockwise for about a quarter of a turn.
5. Connect a 12V-3W lamp to the spring of the contact breaker in series with the positive pole
of the battery (Fig. 9). The lamp should light up.
+ OF THE BATTERY
1 VERTICAL CYLINDER
2 HOFlizaNTAL CYLINDER
6. Rotate the driving shaft slowly, clockwise, until the light goes out or its intensity is lowered.
At that precise moment the indicator should show an advance of 100.(Fig. 8),
7. Repeat the above test for the sake of accuracy.
8. Repeat the test for the horizontal cylinder, taking care to set the indicator at "0" on the
timing chart. .
9. If the reading does not tally with the required figure, loosen the two screws (A and B) which
secure the plate, and rotate it, advancing or retarding the ignition until the correct reading of
100 is obtained.
10. Bear in mind that, if the felt which lubricates the cam is allowed to dry out, the fibrous
slipping block, which opens the moving part of the contact breaker arm, wil tend to wear,
reducing the size of the gap.