taco eater :
Will C from san francisco, CA United States
i think piaggio used a couple different tensions for their stock clutch springs but these were a good 15% stiffer than the ones in my stock clutch.
super rad, just a hair more slip and no grabby at idle. get em
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Works on Bone Stockers
July 30, 2011
taco eater :
Sean L. from Tucson, AZ
This spring is very soft and locks the clutch up very early. QC is a bit low and the hooks are likely to be bent off-axis. Use if you're kinda broke and okay with your single-speed being a total slug off the line, but I'd recommend splashing out for the Polini silver-green-blue set instead. The silvers in that kit hook up about 200rpm higher and fit better.
slightly stiffer than stock 
Works on Bone Stockers