BSA M35-10

[Cees van Rhijn]

Hello, I'am frome the Netherlands and I have the next question: I need a new piston for the M35-10
Diameter 86 mm. What is the best use: the piston of a BSA B33 (500cc) (M.Y. 1946/1953) fit but has Valve clearence machined in the top. Wherecan I find an piston without this valveclearences in top?

[Hoppe30]

Cees,

You can use that piston without any issues. Please note that the standard bore for the B33 is 85mm so you need a +1mm/.040"OS piston if you need 86 MM.

Regards,
Leon