Hi All. I am having problems with pistons and rings on an NSR 250 (MC21) I am bebuilding. More specifically, pistons (pn 13102-KV3-830)and rings (pn 13010-KV3-305) I purchased don't seem correct for the rebuild. The pistons seem to require a flat/rail ring in the bottom groove and a serpentine ring in the top groove. The rings I received (as numbered above) appear to both be flat/rail style rings and do not fit into the top groove. Have you run into this before and if so, where can I get the correct rings?
Mark
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