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Goodwin just put together a custom one for me with my roller secondary

included primary spring, ramps, new pins, secondary spring, custom helix

Oh I dropped to a 25tooth top gear and diff is night and day. actually picked up some top end from it. Sled isn't over geared any more.

Trail burner are you sure he should use that spring? I believe the single pipe on the FIII makes peak power at a different rpm than what it does w/ the tripple pipes that come on the mach 1.
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