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
a good size quad for an avrage sized 12 year old not a fat one is a 125cc for kids
they should ride a 200cc depending on there size or can go to a 300cc
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.
yes
For a 13 year old it depends on your size and your experience with dirt bikes, but an 85 is usually the best size bike and fastest for a 13 year old. Unless you are really tall which you would need a 125.
300cc
Well I would say the max is around 400cc for 13 year olds. I am 16 and my first Quad was a 700 when I was 14:D
Yes You are allowed to race 2 year olds
yes, I use to race a 400ex also and I have a yzf250. they are both great starter bikes.
One size up from a ten year old boy. Or it can be one size down from a twelve year old.
It must be a three year old.
prefferably the 85cc class