I have two a Chore Horse that initially didn't work and a BSA that did. I wanted the Chore Horse, naturally as it was WW2 date, so decided in blissful ignorance to swop parts about. The Chore horse had knackered points and condenser, so I thought change them over from the BSA. Didn't quite work like that. :blush:
In the end the face plate from the BSA fits the Chore Horse Engine block, then BSA points and condenser, change flywheel with magnets as well. The result IT LIVES!!!! :-D
Did intially try to pull start it. Now S*d that! Plug a full battery on, start by reversing the dynamo, when running change to dud battery. Quite a brutal charger, but great when a pice of plant has an expired battery in the middle of muddy hole. Five minutes on the Chore Horse, it can fight but never wins.