Hello, I have been a lurker for a year and have received lots of good ideas from this forum. I would appreciate a bit of specific help on my new kit. This is a '01 Tomos Sprint, with stock carb, tecno bullet pipe, #60 jet, B8HS plug, open intake, Airsal 65cc kit with new reeds. I took the time to clean up the kit before installing, polishing ports, gapping both rings & deburring the edges of stuff. It runs pretty good with about 10 miles on it so far, using premium with regular 2T oil at 35:1 ratio mix. Plug chops look good, though I am only going 3/4 throttle (about 33 mph). After riding for about five minutes, the bike gets noticeably slower, yet also much smoother/quieter in vibration. I'm guessing it's heating up & something is getting real tight, but I check and there's no evidence of a sieze. Any ideas?