I put a Malossi variator and clutch spring in a 2006 Vespa LX50. Marginal improvement, but it helped on both ends.
I also put the same set up on in a 2010 Aprilia Scarebeo 200. Wow. Huge difference. I just tested it. I was passing 70 MPH and it was still pulling hard. Great low end also. It changed the entire performance range.
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