1991 Ohlins 360 Mistress

I have one. It runs like a 250 on steroids rather than an open bike. Mine runs clean from bottom to top.

Under a fast rider they can eat a clutch in one race...or less.

Whymee, I had one way back when. Overall I liked it. I didn't eat clutches but i used steel plates, heavier springs and ate the tranny. Cured it with the wr trans gears. wider ratio, motor liked those better. I would use 92 or later crank+cases. had a , 2mm longer stroke. then wr tranny clutch improvement. Balancing. The 360 used a much heavier rod/piston pin, than the 250 so balancing was off.Maybe take some weight off of that reciprocating mass first then balance. The later 360 cylinders supposedly had some modified porting in the exhaust. In any event, a cool piece to own. Realistically though a good running 91 yz 250 , would give it fits. Noleen used to have the 360 manual online but lately it doesn't come up for me. I am sure if you e-mail them they could send you a copy. They had recommended jetting specs, porting? timing specs in the manual, Pipes are rare maybe dynoport still makes them. BTW i had a 91 yz 250 with the noleen ohlins suspension. was a pretty solid suspension for the day. The fork went from total crap to hey this thing is pretty damn good. Shock was decent even the stock ones, but the ohlins might be more desirable just from a rebuild standpoint. Good luck with the mistress