Anyone ever machine and sleeve a cyl to take a 750 cc liner?
Often some discussion as whether it's safe to go +80 so to get 750 cc might be a stretch
I have successfully ran 80 over Triumph 650 without calamity But assume boring to that size in a BSA would leave it a bit thin. Overbores on Norton cyl twins is always a Vegas odds crap shoot. About half the time (or more) you either run into casting voids, dross or defects OR discover the cyls are hair cracked right above the flanges on the 750s.
However what I am talking about is machining a stock BSA cyl to take sleeves to a 750cc bore + or - and opens up some options on what pistons to take.
Some decry sleeves as asking for trouble, But if properly sized and machined they are fine for something like a Preunit BSA Twin (Street use of course and a sedentary pace in general)
I am sure others have done this. Just looking for links or accounts of others who have tried?
I dont have much to measure with. Currently have multiple A10 motors but only 2 thin flange cyls.