Thats a zongshen motor, maybe a bigfoot frame im not sure i dont think its a genuine crf at all..
depending on the hours on the bottom end it looks to be a good chassi so maybe about 750 or lower
i'd ask 650, and go from there, as its probs got the 160ho in it and it doesnt look too bad. pro taper bars usd forks, decent lookin fram and swingarm etc. but yeah mate im pretty sure thats no honda and yeah the zongshen 160 is a great starting point for any bike. its pretty strong and reliable, and if you want to upgrade it theres millions of performance upgrades out there to be had. the only bad thing i've heard about 'em is the tranny's wear out after a while, but alot of people on here have had 'em and they'll point u in the right direction