I'm rebuilding what was once a Hagon
grasstrack bike for sprinting. It's basically a C15 engine, but with what I think is a shortened B50 crank (80mm stroke, roller big end, end fed ) A cam of which I'm uncertain, but it doesn't match any of the BSA ones, A65 valves and running on methanol with a Gardner carb and magneto ignition.
The bore was worn, so I had to fit a Triumph piston, taking the capacity up to 299cc.
The compression ratio comes out to 16:1 if I don't alter anything so I'm planning to pack the barrel up a bit further (it's already raised for the long stroke) to bring it down a bit.
I was thinking that 14:1 looks like a good figure for methanol.
Has anybody run a C15 at this sort of figure and whether the stock head studs will take it?