The stock clutch starts to slip at 122 mph or 40 hp. That was a stock used clutch. But I have seen other bikes top out around there. I have modified the clutch by using an Barnett carbon fiber clutch with very strong springs. They say it will be good to 100 hp. To help the clutch and everything else I delay the nitrous power for about two seconds . Ramping it up from 75% to 100 %.
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