United is bringing in all kinds of Chinese clones of other stuff. This one looks like a Zenoah G-45 or G-62, except for the polished case. (and no magneto) At over $150 bucks cheaper than the G-45, and with electronic ignition, it looks really good. I'm hearing mixed reviews on how they (the Chines clones) run and perform, hope you get good service from it.

I had looked at an SV-50 twin that United markets, they got "out of stock" permanently engraved on their site There is another site selling the same engine for $160 more than United, and they have pics of some other engines by the same mfg. Oddly, the twin uses the same cylinders as the 25cc single they sell; there's a plate over the intake port on the cylinders of the twin that corresponds exactly to the port on the single (the twin uses case induction).