I was surfing eBay for 80cc 2 strokes and came across Yong Xing Mach. Zone as an international seller on eBay. Their store lists a 49cc in frame 4 stroke kit for 169.00 + 130.00 shipping from China. This is supposed to be an improved version with less noise. The pic's look like a large frame is needed to fit everything in. I was planning an 80cc as power for my next build, but this has possibilities. I have just completed a Schwinn point beach cruiser with a Titan XC50 4 stroke. I have a geno beach cruiser with a 33cc rear mount which is light and easy to ride, needs a springer fork and a change from a 44T rear sprocket to 48T to make it really sweet. Any info or thoughts on the Yong Xing 4 stroke is welcomed.