250 C or Lites C would be the two beginner classes
prefferably the 85cc class
if he is just starting then 250 beg
For professional motocross, the biggest bike that is allowed to be raced is a 450 four-stroke. For local race purposes there is a Vet class that allows any size bike to be raced (usually up to 525 since that's the biggest motocross bike that KTM makes).
125 or 250 if you fit on the but but they run together in the 250 class
25+ vet A and vet B or 40+
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!!!!!!
Depends on the track, some tracks have a class for pit bikes to race in.
First of all, you can't play motocross, you race motocross. Motocross is the outdoor version of dirt bike racing. Supercross is indoor. Professional motocross racers race for 30 minutes plus 2 laps.
They would have to be in a 90 cc class or lower to race quads. But you can be any age to race dirt bikes.
A national motocross race consists of two (2) 30 minute plus two laps motos.
motocross started when people decided to race road motorcycles on dirt
motocross started when people decided to race road motorcycles on dirt