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i have a 2012 summit sport power tek 154 when i took my sled out for the first ride it ran like junk even with fuel stabilizer, finally got it running good but now when i rip across the field wide open it hits 8200-8300 rpm as it should but only for a couple minutes of riding then it doesnt go past 7000-7500 if i stop for a minute go again it hits the right rpm but only for a minute then drops back down i have tried changing my clutch weights lots but still only hits for a minute any idea what else this could be?