Contact breaker gap .012-in. fully open. The contact breaker can be removed for cleaning by unscrewing the central hexagon headed screw and withdrawing the breaker. The contact lever will lift off from its bearing bush after ﬁrst raising and moving to one side the check spring which secures it. Take care not to distort the contact lever control spring.
When replacing the contact lever, smear the bearing bush very lightly with thin lubricating oil and wipe off any surplus. In no circumstances must oil or grease be allowed to get on to or remain on the contact points themselves.
Removal of the high tension pick-up brush is dealt with in a similar way to that of the standard magneto.
For other directions, see B.T.H. Instruction Book 1377 Edition " E " available from the Magneto makers