It's been my experience that exhaust tuning is probably the most important key to getting power out of a two stroke. Yeah carbs, yeah porting, but if you don't have a pipe that reflects the pressure pulses properly, it's all for naught. Two Stroke Performance Tuning by A. Graham Bell is a fantastic book and will provide you with more info and insight into the black art of two stroke tuning than you'll know what to do with. Through what I learned in this book, I was able to get 48.2 wheel HP from a '99 Honda CR125 running on C16. Next step is fuel injection via Megasquirt, and I expect to make over 50 HP. My point: BUY THE BOOK! You'll be amazed.