BSA Owners' Club Forum

The BSA Workshop => Singles => Topic started by: Dabbist on 30 October, 2017, 19:31:44

Title: B40 Piston
Post by: Dabbist on 30 October, 2017, 19:31:44
Hi Chaps,
              Having got my engine apart (well, the top end do far) and done a bit of measuring, it's clearly time for a rebore. I intend to fit a high compression piston anyway, but I'm having a lot of difficulty finding one.
There seem to be quite a few places selling the JP ones, but I keep reading horror stories about poor machining and frequent seizing.
Has anybody got any suggestions for finding something better?  I'm looking for an 8.75:1  +20, or +30.
In fact while I'm pestering, a source for an SS90 cam would be very welcome too.

Many thanks