Just spotted this bike for sale and it’s pretty sweet. It started as a UM250R, that’s a United Motors, which I thought was a rebadged Hyosung, but the owner says it’s built by Suzuki for United. At any rate, he pulled the stock 250 4 stroke V-Twin and shoehorned in an RZ350 Banshee 2 stroke, billet stroker crank yields 440cc. Forged pistons, billet clutch, programmable ignition and lots more, with modifications is now delivering 100hp. It looks very well done.
I found some details of the build online over at KO Rider and it seems he actually first had a bored and stroked RZ350 displacing 535cc in there at 125hp but pulled the engine for another project and built this engine. The 535 will be a turbo bike!
2 strokes, gotta love ’em.
Link: UM250R 2 stroke conversion – auction over