Hi, Welcome to the Silverwing 600 Forum. We ask that you be polite and also introduce yourself on your 1st post. The members are friendly and helpful so just have fun. There is www.maxi-scoots.com site that is geared for all scooters and motorcycles.
I'm glad you said something about the big clutch spring. What I was thinking, a while ago, was adding a thin spacer ring at the end of this spring. It would give it a little more pressing power on the belt sides.