So after combing thru the forum, I finally said let's try it. I bought me a flexshaft grinder and various bits and went to it. I didn't have a degree wheel so I didn't take any timing numbers. I just tried to not change it any. I widened intake and exhaust port to roughly 70% of bore. I left the intake ruff and tried to polish the exhaust some to help minimize carbon build up. I don't have a 90* hand piece.