I had a number of these bikes, usually at least two at a time as working bikes, so they would have had various Suzuki pistons and rings. We could only get Std., 0.5mm & 1.0mm oversize in New Zealand.
As far as the porting went, I did it myself. I made sure all the ports in the cast iron barrel matched the alloy, smoothed the alloy in the inlet piston port and reed valve port, knife-edged the transfers and enlarged the exhaust port, with a small T-port.
Always happy to answer questions.
Cheers
Nigel Marx in NZ
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The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
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