I have partially stripped my MC18 (88/89 vintage) which is running with rs250 ignition and coils. It also has single ringed pistons. The pistons look o.k. but I would like to change the rings. It has only ever been used as a track/race bike. The Honda dealership reckons the piston is 0.5mm under size at 53.5mm and is having trouble finding the correct rings. Anybody got any suggestions as to what these pistons might be from or where I could get rings from? There are no stampings or markings on the piston anywhere.
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