I had problems with my clutch slipping and studdering, so that's why I adjusted it. It already had a red big spring and yellow little spring installed, which I posted about in the People 50 forum - it doesn't seem likely to be stock. I replaced them with new springs of the same colors before putting the clutch back together. If I understand how the clutch springs work correctly, with this combo of springs, the clutch shouldn't engage until 1500RPM's.
With the new springs (and a good cleaning), my clutch no longer slips and studders, but I'm still not seeing speed/performance that I had with my other People 50. I can hear the engine revving higher than it did before I changed springs though. Next I'm going to adjust the variator rollers again to see if that helps - I'm planning on trying out the stock 8.5 gram rollers again with the new clutch springs to see if there's a difference.