I am considering the same thing MF, going to put a new piston (worn where gudgeon is) in a very nice Sunbeam Lawnkeeper 160.
At sca, there is a
big hone for $74,
or a
small one for $28.
The big one will do down to 50mm, a 125cc is 53mm. 160cc is about 62mm from memory.
So I suppose it is a matter of deciding if a larger one is worth it for any other uses like motor bikes or car engines
