OH and I'm running the stock high compression 50cc head with my Airsal 70cc. It's got really sweet compression. I think tightening the clutch will help along with some Wheel maintenance. I took out the axle on my front wheel today and there was hardly any greas in there and a ton of grit. That can't be good for my low end. Plus I have some loose spokes and need to tru the wheels up... I found all sorts of stuff to work on today...