Always wanted to do this..
I just built my first bike and lemme say...these things are friggin awesome! Ive been riding around on this black on black beach cruiser since last summer. I was planning on figuring out a way of putting a lawnmower or chainsaw on it, but then I saw how cheap these motors were so I went ahead and bought one of those 66cc Skyhawks.
It took me a few days to put it on..I had to get someone at ace hardware to fabricate a metal piece so I could mount the engine and I took a large hammer to the exhaust pipe to get that out of the way of the pedal. Other than that it went smoother than I expected. I pretty much came here every time I had a question and usually found the answer I needed (search feature win).
I dropped the seat all the way down and I'm currently fashioning a head light out of a half sized aluminum baked beans can and some LEDs. I'm not sure what I want to do for my tail light yet. I think I might mount some LED's on the very end of my frame near the axle. I also want to make some sort of fenders because I got drenched on my first test drive...I just couldn't wait til tomorrow.
Anyways..I'd like to say thanks and here's a pic of my bike before I took it to the streets.