Which type of MX bike can enter an official race?

Question

Can a 250cc two stoke race officially and can a 250cc 4-stroke race officially or are they just bikes in different classes? How fast can a 250cc 2-stroke accelerate compared to a 4-stroke? Please be specific!! How fast is every revolution?Which is better 2 or 4 stroke? Yamaha is good right? YZ250F or YZ250?

Answer 1

they can race together it depends on the track setup rules, they may allow it or they may not.

they both can accelerate at almost the same speed but the 4 stroke accelerates a bit quick and is more smoother

4 strokes cost more to repair then 2 strokes but 4 strokes are more reliable.

in my opinion yamaha is the best, i race and 08 yz450f and love it

Answer 2

250 4 strokes race in the "Lites" class with 125 2 strokes. 250 2 strokes race in the "Premium" class with 450 4 strokes. 250 4 strokes and 2 strokes do not compete against one another. In perfect traction conditions (which rarely occurs on a MX track) a 250 2 stroke will out accelerate a 250 4 stroke. On most tracks however the 4 stroke, even though it has less horse power, will turn faster lap times because the 4 stroke works well in low traction conditions. Also you don't have to shift quite as often and being a gear too high coming out of a corner doesn't cost you a bunch of time like it does on a 2 stroke. You can also corner more aggressively on a 4 stroke because it doesn't have to tendency to break loose like the 2 stroke does. It only takes one trip to your local race track to see that the 4 stroke is superior and is the bike of choice for any serious racer.