Hello from sunny Arizona. The great info in this forum site gave me the confidence to order my first bike engine today. You can bet I would have twisted off the cheap bolts and tried to cut gaskets from a cereal box if I hadn't been studying this site.
Engines 48cc and under can be ridden in the bike lane here, so I picked one of those Chinese mills that mounts in the frame. It bears an uncanny resemblance to the Mattel Vroom play engine that I had on my banana seat bike as a kid.
I tinkered with 2 stroke motorcycles for years, so I think it will go well if I do a good job on the installation.
My wife is not happy about this, but I think that will change when she takes her first ride on my machine.
My first victim (bike to be motorized) is shown below. It's an aluminum mountain bike, styled like a cruiser, with vertical wheel dropouts in the back.
If the motor wont fit, I have another mountain bike with a small diameter, straight tubed, chromoly steel frame that would easily do the job. It also has vertical dropouts, so I don't have to worry about the back tire staying in place.
Nice to meet you all.