4 stroke cc limit ????

[turbo appex]

what is the cc limit in the 70 and 50 classes at atva nationals

[EthansDad]

Here is what I found in the AMA rule book. for the 50cc, I don't think there is a jr stk bike that would fit the bill and be competitive. for the 70 class, you could mod, but looks like your still bound to the same displacement. someone correct me if I'm wrong, but found this in 2009 AMA rule book.

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H. Youth Engine Classes and Age Groups
1. Youth classes may not exceed the maximum listed class
displacement.
a. With rider in normal riding position with hands on
handlebars, there must be a bend in the elbows,
fingers must reach all control levers. A rider in a
standing position on foot pegs must have 3 inches of
space between seat and rider inseam.
b. Youth 4-Wheel Classes
Class Age requirement Engine size Engine type
1: 50cc 0cc – 50cc 2-stroke
Stock
4 – 8 yrs
0cc – 50cc 4 stroke
Maximum width 41”, Maximum wheelbase 41”, Maximum
suspension travel 4”
Class Age requirement Engine size Engine type
2: 50cc 0cc – 50cc 2-stroke
Stock
6 – 8 yrs
0cc – 50cc 4 stroke
3: 50cc 0cc – 50cc 2-stroke
Production
6 – 8 yrs
0cc – 50cc 4 stroke
4: 70cc 0cc – 70cc 2-stroke
Stock
6 – 11 yrs
0cc – 70cc 4 stroke
5: 70cc 51cc – 70cc 2-stroke
Modified
6 – 11 yrs
51cc – 70cc 4 stroke
6: 70cc 51cc – 70cc 2-stroke
Production
6 – 11 yrs
51cc – 70cc 4 stroke
Class Age requirement Engine size Engine type
7: 70cc CVT 51cc – 70cc 2-stroke
Production
6 – 11 yrs
51cc – 70cc 4 stroke
CVT belt driven
Class Age requirement Engine size Engine type
8: 90cc 71cc – 90cc 2-stroke
Stock
8 – 15 yrs
75cc –
125cc
4 stroke
9: 90cc 71cc – 90cc 2-stroke
Production
8 – 15 yrs
75cc –
125cc
4 stroke
10: 90cc 71cc – 90cc 2-stroke
Modified
8 – 12 yrs
75cc –
125cc
4 stroke
71cc –
105cc
11: 105cc 2-stroke
Modified
13 – 15 yrs
75cc –
150cc
4 stroke

[Logan #34's Dad]

Correct! no cc limits in the 50 or 70 class. It will have to happen soon.