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I have modified BSA 350 pistons to fit in a Triumph 650 to create squish bands in the head. If one gets dinged, replicating the modification is a pain in the arse. However the pistons were much lighter than standard and gave a performance boost. It depends on how often you race. These days it would not be a problem for me. But when I was a kid, I used to race every month. In those days a Japanese bike with lots of throw-away parts was always a better option. This is the reason that the two-strokes killed off the manxes, plus they were faster.

[QUOTE="acotrel, post: 344225, member: 4295"] I have modified BSA 350 pistons to fit in a Triumph 650 to create squish bands in the head. If one gets dinged, replicating the modification is a pain in the arse. However the pistons were much lighter than standard and gave a performance boost. It depends on how often you race. These days it would not be a problem for me. But when I was a kid, I used to race every month. In those days a Japanese bike with lots of throw-away parts was always a better option. This is the reason that the two-strokes killed off the manxes, plus they were faster. [/QUOTE]