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If you git it from Zumasrus you should be fine. Thats Team Calamari if I recall. If the old clutch worked fine, why replace it? But anyways, I have a feeling the new clutch engages at a different RPM, causing a clash between the engagement (lock-up of the clutch) and the weights of the variator. Is this a 2-stroke bug-eye or a 4-stroke Zuma 50cc?
Be forewarned that playing with variator weights is a hidden art, sometimes calling for a lot of butt dyno runs to find what works best. Tuning Matters used to have a good how-to on steps to tune and general guide lines that were pretty accurate to real world riding, meaning someone on Tuning Matters did their homework.
I've been half tempted to check out a dark green Zuma 50cc 4-stroke in my area. Low miles, one owner and clean looking in the pictures. I'll hit up Dee Dee over at Modern Buddy and buy his one and done kit. Keep the motor stock for reliability.
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