I am 15 and I own a yfz450 with moderate modification (ex. pipe, jet kit, intake, tires,) and I race arenaxross in the midwest, good series if anyone live in southern illinois or close to it. But back to the point, I run open beginner and would also like to run 200/300 but still be competitive in the beginner class against other 450's. I was thinkin about putting a ktm 250sx in the frame, I read in motocross action that with just a pipe that motor will pump 40 horses that would be just as good or better than what I have now. What do you guys think.

 

Looking for others to race with?
Try ATV TrailMasters ATV club
Its an Illinois ATV club with lots of guys that race.