Is the clutch pack depth correct? When I first got a slipper clutch I built the clutch pack and it work beautifully for a few hundred miles then started slipping, turns out the clutch needed another plate as when the clutch material started to wear a bit it was too shallow to bite.
Alternatively is the spider spring OK? is the clutch drum tight? the large diameter nut torqued up correctly? have the bearings slipped off the ramps?
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