Ignition Timing
The ignition timing is accurately set within very close limits and there is no manual
adjustment for the rider as this has been found quite unnecessary in practice.
The
contact breaker cam A, (Fig. 2) is keyed on to an extension of the mainshaft, and its
position with reference to the piston position is therefore constant.
Any variation in timing can only be secured by moving the contact breaker
housing B (Fig. 2) which can be rotated through a very small angle by releasing the
screws D, not forgetting to retighten them after the adjustment has been made. It is
emphasised that this is a works adjustment rather than one which the private owner is
ever likely to carry out.
In order to obtain correct timing and proper functioning of the contact breaker, the
points must be set when in the fully open position to the correct gap, and this point
should be checked periodically as recommended on page 28. To do this, turn the
engine until the points are fully open and insert a feeler gauge between them. The
correct gap in this position should be ·015 in. (·38 mm.) and if this is found to be
wrong release screw E about one turn with a screwdriver and move the adjusting
plate up or down until the correct gap of ·015 in. has been restored, finally
retightening screw E.
Fig. 2. Contact Breaker
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