Vibration

[berkeley]

I just recently changed to a Koso variation. After adjusting weights a vibration happens when I let off the throttle and decelerate. Any suggestions.

[aeroxbud]

Did you leave some slack in the belt behind the variator when tightening the nut up?
Did you also make sure with the new variator that the spline doesn't stick out too far? www.pedparts.co.uk/blog/variator-fitting-crankshaft-pulley-spline-damage