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[Mick grinter]

There are quite a few pistons with the pile of parts,they don't look to have a lot of wear.I noticed they are a flat top piston and the H1 is a domed and it sort of fits snug into the head.From memory around a 6.8-1 or close to that and the Suzuki seems to get a higher compression ratio from a flat top piston.
It must breath better than the early kawasaki's.Or the reeds trap it better and you don't loose it back into the carb.