I personally like the GY6 for its simple design and parts are cheap. If you haven't done so already the head is where you will make the most HP anyway. I also have determined that the cams available can be improved upon to get more HP out of the engine. Right now my power range is up around 9000rpm. Last year @ the bash drags I had my head up my but and got a late start. I was running against a modded yerf. On top of the late start I spun the tires in the sand so I had to let off. I could see the difference in the cam for @ the 150' mark I caught and beat the yerf after falling almost a buggy behind off the start. The power @ the higher rpm was awsome. I now have put some 3:90 final drive gears in and still am pulling above 9000rpm but it starts sputtering as if its starving for fuel so I am going to richen up the carb a bit to see if it helps. I have a custom cam with 30 deg valve overlap and that really makes the top end power. Can't wait to see some vids of the single seat yerf.
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