Well, I'm all new to bicycles with motors, but not motor bikes, or bicycles for that matter. I am putting together my first 80/66cc. I got the whole thing finished to find out I had a factory defect magneto. I am waiting for the part. Also, while waiting, I read up, in this forum, about preformance and ordered a slant head for higher compression, a 36 tooth sproket, a chambered & tuned exhaust, and I took the time to port and polish my intake and exhaust. I can't wait for the brown truck to show up.