It didn't take me long to put grooves in mine either. I haven't noticed any problems, but there was wear when I took the engine apart.
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88 250r
Motor - 4mm stroker mx ported, Sparks pipe, 38mm AS, v force reeds, Hinson basket w/ Barnett plates
Chassis - PRD narrow frame, Janssen +3 arms, Ohlins LT big bodies, cr500 link Walsh swing arm, Ohlins rear shock, LSR axle, Denton stabilizer, AC propegs  |