78'&79 rm400 piston differences?
heres my problem i own both a 78' and a 79' rm 400 i bought the 78' without a piston. the local parts dealer sent me a piston with two ring grooves in it , but when i ordered the rings they sent me one ring. heres where it take a twist the parts house schematic shows the 78' with two rings and the 79' with one ring, on **** recently there was a 78' parts motor that had a single ring piston in it does anyone know or have a 78' rm400 motor that they have disassembled so as to clear up my dilemma?
heres my problem i own both a 78' and a 79' rm 400 i bought the 78' without a piston. the local parts dealer sent me a piston with two ring grooves in it , but when i ordered the rings they sent me one ring. heres where it take a twist the parts house schematic shows the 78' with two rings and the 79' with one ring, on **** recently there was a 78' parts motor that had a single ring piston in it does anyone know or have a 78' rm400 motor that they have disassembled so as to clear up my dilemma?
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