No we can't use 100cc 4 -stroke dirt bike race against 85cc dirt bikes.
Base price for a 2008 RM 85cc was $3099.
With bands they can go 80
There are several different "types" of dirt bikes! For brands there are Honda, Yamaha, Suzuki, Kawasaki, KTM, Gasgas, Aprilia, ATK, etc. For displacement, the most common ones are 50cc, 85cc, 100cc, 125cc, 150cc, 200cc, 225cc, 250cc, 350cc, 400cc, 450cc, 500cc, 600cc, 650cc, and even 700cc! As for actual types of dirt bikes there are motocross bikes, enduro (dual-sport) bikes, trials bikes, trail bikes, and many variations and setups like desert, dunes, ice, supercross, etc. Ride safe!
2 stroke, 10- 15 years old is a good year spand. 4 stroke, 4- 8.
50cc , 65cc , 85cc , 125cc , 150cc , 250cc , 500cc are the most popular but there are a few others
yes iif u put a bore kit in it
You would fit, but if you're still growing, I'd recommend a bigger bike such as a 125cc. If you're stuck on two stroke bikes (like me) then you should buy a used 85cc because you will grow and need to switch to a 250cc in about a year.
KTM 85cc ownz any bike out there, if you cant get, suzuki for second. I agree with the first guy but parts are extremely hard to find so go with something more like the suzuki or the new Honda crf150. High perfomance and theyl eat up a 85 two stroke.
they can go pretty fast. they will beat a Yamaha blaster 200
The CR85R expert cannot race in the regular 85cc class in the AMA. A cr85r expert can race in any desert race in the 85 class, including AMA. In motocross its a different story, it depends on what the rules of the track are. Most of the they have a special class for the 85 experts but the problem is that they line you up with the 125 two strokes, and a 125 two stroke is compared to a 250 four stroke so your racing with the big bikes. Hope I Helped, KEEP RIDING!!!!!!
The following is from one of my local motocross tracks, most local tracks should have something similar: 0-85cc 7-15 Beginner 0-85cc 14-15 years 150cc and smaller 4 Stroke, 15 years old & younger
 and any of the novice or intermediate classes depending on their ability
50cc 4-stroke 50cc 2-stroke,65cc 2-stroke, 70cc 4-stroke, 80cc 2-stroke, 85cc 2-stroke, 110cc 4-stroke, 125cc 2-stroke, 125cc 4-stroke, 150cc 2-stroke, 150cc 4-stroke, 200cc 2-stroke, 250cc 2-stroke, 250cc 4-stroke, 300cc 2-stroke 350cc 4-stroke, 450cc 4-stroke, 500cc 2-stroke, 530cc 4-stroke, 690cc 4-stroke