i would like to start racing mx but i have a 240 kit and i dont feel like buying a stock cylinder and head soooo any of you racers know of a class that a 240 can run in?
Is it stamped 240? If not, I wouldn't worry about it a bit. Most of the classes are up to 199cc Two Stroke vs. 300-400's. I would worry about suspension before worrying about the engine.
I applaud the guy for wanting to stay honest and to the guys who said just cheat because everyone else is...shame on you all!
As for a ported stock blaster cylinder running with a built 300ex motor, NOT happening. Maybe about 6-8 yrs ago it was possible but too many serious engine builders have figured the 4 stroke out. Matter of fact a built properly hi comp raptor 250 is hard for a built blaster to run with unless you get the CT type cylinders and port the hell out of them.
If you go with a 240, most likely you will be racing 450's or maybe 250r's if there is any.
The new schoolboy mod class at atv nationals won't even let that motor in against the 250 dirtbike motors.