yeah they got the suspension well sorted by the mid 80s models especially on the 250s which where really a slightly detuned road legal yz,i had full road rego on the 400 and 250s,the 400 on the road would really out drag any car!if you could keep the front wheel down,a mate had an It 465!again just too much power really and your either just spinning the rear wheel wildly or fighting to keep the wheel down,more suited for desert racing i think than tighter trails use?he later had a TT600 which i liked a lot,like a big fat chuggy chuggy yz,it was a great bike i spent a few days on it,i wish we had these cheap action cameras back then!