Made by Wellworthy and they always seem to have been at the top of the tree when it came to pistons and rings.
The 'Mile Masters' have a chromed top ring though (I think) so not suitable for chrome bores and possibly some liners (not a problem on a standard Norton)
Made by Wellworthy and they always seem to have been at the top of the tree when it came to pistons and rings.
The 'Mile Masters' have a chromed top ring though (I think) so not suitable for chrome bores and possibly some liners (not a problem on a standard Norton)