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This is just my personal opinion from racing mx against the 450's. A built 310cc motor will get you mid pack. You will be faster than some 450's, and you will be slower that the built 450's. A built 330 will get you in the top 5, very close to neck and neck with built 450's. A built 350 or even 363 stroker motor will get you past the built 450's (not all of them but the vast majority). A 350 or 363 stroker motor gives you enough power to surpass the 450's, especially in acceleration. So it really just depends on where on this scale you want to be and how much you want to spend to do it.Thank you that is what I need, a built 350,,, I will do the rest.
I'm sorry if u take this the wrong way, but your setting it up for MX and your worried about motor! Rockets only fly straight, last I remember is mx ain't straight. Power + traction = accelerate the more the tires stay in contact with the ground the faster u will go. There is more to making a bike fast on a mx track then HP. Lots of good info out there about putting together good package for the track for dirt bikes that applies directly to atv's. IMO.I got that worked out, PEP set up for me, Tires, and nice wide ride, I just want to get in there and not just look good but want to go.
