OH Boy, now you’re talking ‘Rock & Roll’ !!!
I had an A10 pulling a chair. I think the A7 and A10 where the best pre unit-construction bikes made by BSA.
Don’t Sell it. I know they fetch big bucks these days but you’re holding a piece of history in your hands Andy.
To raise the compression ratio on mine I removed the head, put some plasticine on the crown of the piston, re assembled the head and turned the engine over by hand. Then removed the head again and measured the thickness of the plasticine. Then skimmed the head down to that level. Ended up with about 13:1 and a very narrow power band, but a lot of BHP.
Found I had to beef up the clutch springs. Unfortunately I blew the Big Ends out. :cry: (It seemed a good project at the time. Ignorance is bliss!) Used to be the first chariot away from the lights every time.
Used to hate starting her from cold with manual advance/retard. (Never let your leg become straight on the kick starter…..Just in case!
)
Hang on to it Andy, there can’t be many left these days.