Hi JHG and All,
I think I have found the issue
The instructions say to fit the unit for anti clockwise rotation for BSA twins
BUT They are referring to A50/65 where the unit is on the other side of the bike and rotating anti clock looking in from the RHS
On the A10 the magneto / ign unit rotates anti clock looking from the RHS
SoWhen looking at the ignition from the primary (left) side the igniton rotor is turning clockwise (opposite to A65)
So re time the engine using the clockwise position on the ignition unit
John