My son is 12 yrs old, 4'9" and weighs about 90-95lbs. He is coming off a PW80, which while small for him, was good for him to learn on this past year. He has shown some skill and was rdy to move-up to a bigger bike in short order. Problem is, from what I've read, is that he's currently a tweener between the 65's and 85's. He appears to be on the hvy side and maybe a bit tall for the 65's. But, he appears to be a bit short for an 85 (even the shorter KX). Really short for an 85 considering he'd be learning to use a clutch as well. I could go with a CRF80, which would be a good fit size-wise but I'm afraid he'd be pushing its limits in no time and then seeking a higher performing 2-stroke. Any suggestions appreciated - Thanks !