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I know this is an old thread, but I'm hoping this will help someone else, because I've recently been in the same position, wanting to swap my 50 cc from my Tao Tao Racer to a 150cc, while keeping it as stock looking as possible. I'm actually having to order a brand new bike just to get all the parts I need for the swap. The Holy Grail engine that we've been on the hunt for is an LK157QMJ. The 'LK' designation means it was manufactured by Leike, who makes a bottom mounted version of the GY6 150cc. Up until recently, the only bike that I knew of that they put it in was the Roma Super Hornet, which hads a dual shock shock setup in the rear, but to my understanding, (and I'm about to drop over a grand just to verify this) they are now just recently putting it in a Cougar Cycles Rocket with a monoshock configuration, which is what I need for my particular build. I've actually had my hands on a Super Hornet, and I know that engine would fit with little modification, but I would have either had to try and reuse my stock monoshock bottom bracket, or fab a new one, but if the spec sheets (and the sales staff at saferwholesale) are correct, this new model has the same engine, but with a monoshock out back on the Rocket, and the Rocket is like 3-400 cheaper than the Super Hornet. I have searched all over for a source for just the engine, but the lowest cost I've been quoted for the engine only is 680, and that's with no mounts, carb, pipe/silencer, wiring harness, etc., so it will be more cost effective in the long run to just order a whole bike, swap the engines both directions, and hopefully end up with a 50cc (actually 88cc BBK) Rocket to sell, and a 150cc Racer to ride!