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a greater mechanical "ease" at high speeds and a constancy in performance you've never experienced before with the original version
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Malossi part number 3219491
This will not fit your stock style large taper crankshaft
Totally 100% stock and running
Derbi Revolution J.Costa Race Variator and Clutch Kit 305 a greater mechanical "ease" atA variator and clutch kit like we have never seen before. J. Costa Race kit for Derbi Start 3 and Start 5 engines. This kit includes a front IT50Pro variator with 3 sets of weights for fine tuning. The rear clutch uses a unique transverse action for a faster response than a traditional clutch. Is reinventing the wheel the solution for your track prepped Derbi? Maybe? J. Costa developed this setup with the race course in mind.
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