Hello Guy,
Thanks for replying, as far as I have ascertained, the maximum oversize Triumph piston was +40thou.
So your information is useful, thanks. It's possible to buy 72.5mm pistons for a range of modern bikes.
I'm confident the barrel I have will stand having 10thou removed from the wall thickness.
My problem is......I don't have an original 3hw piston to compare the one in my engine to.
So I don't know wether it gives the required compression ratio etc. I would rather not go to the trouble of working this out.
I hoped someone on here could give me the gudgeon pin to crown dimension of a standard piston. This will hugely assist me
in my search for a modern oversize replacement, if that makes sense?
Thanks again,
Tim