I have built 5 minibikes since 2004- pretty much spend most of my free time doing this. ( I rent so my land lady does all the home stuff- she gives me free reign of her workshop to boot!!) Anyway I have built a mini for every daughter, neice and nephew that I can. Now I want to build one for the purpose of selling and hopefully make a LITTLE profit. Id use mostly brand new parts. I cannot build one cheaper than what we can buy the MiniBaja from TSC but the Baja is a large bike and I plan to do a 3-4hp bike. I have been looking at the smaller Baja motorsports frame, fork w/wheels and tires on ebay. Like $150 shipped. I need to hit the yard sales in the countryside as a $5 frame would be oh so sweet. I like to cut off the non adj handle bars and install motorcycle clamps and handle bars. I mount the engines and handle bar clamps on bailer belt rubber as it dampens vibration SIGNIFICANTLY. ($5 /sq foot at TSC-tire sidewall will work too) I believe I could sell it just by putting it in my front yard. If not Id list it on SleazeBay. Small Eng Warehouse has a 3.1hp Kawasaki Flathead for $170 Id love to try. The also have a 3.5 Briggs I/C that works great-$190. I used a JiangDong on my daughters bike. It runs excellent but I would not recomend one to someone who cannot do any work themselves. When I went to use the accessory holes around the crank the threads just crumbled and pulled out- all 4! I had to drill and re tap. (This is a metallurgy issue that China is notorious for) I have a nice 1971 Dodge Demon. I am aquiring the parts to build up the 360 but paying $180/week in child support makes a car hobby non feasable. The minis are a hobby I can afford! I have thought out loud enough-sorry for the ramblings. Mike