depending on how much power u want him to have if u want hime to have a bike around his size with lots of power i say like a kx 85, cr85,or a yz 85, but if u want a little less power and more of a learner bike he can still have fun on and grow on i recomend the ttr 125 i have two friends that have had them for 2 years and at 14 still have a lot of fun.
ttr 125 mabe
ttr 125 mabe
new bic
you should get a crf 250x
ttr125 i think
depending on how much power u want him to have if u want hime to have a bike around his size with lots of power i say like a kx 85, cr85,or a yz 85, but if u want a little less power and more of a learner bike he can still have fun on and grow on i recomend the ttr 125 i have two friends that have had them for 2 years and at 14 still have a lot of fun.
hey
honda honda honda xr80r the best bike for anything