Currently Own
'85 Honda Big Red 250es
'84 Honda Big Red 200es
'81 Honda ATC 185s
Unk yr Adventure Vehicles 3 wheeler
It will fit ATC185's and 200's, and the first gen 200X, and will have a bigger intake port than all of them if its off a 1980 or newer. It will also bolt on to '86-'87 125m cylinders but it won't accept the M cam, you'd have to run an earlier cam, plus the pulse generator housing and cover.
I don't need it right now but if no one bites I might consider it just to put it on the shelf as a spare.
1985 Tri-Z 250
1985 ATC250R