Hi all; Well I'm hooked. This is more fun and exercise than a 61 year old should be allowed. I have currently done 4 builds. My first was a 66cc Zoom HT that I installed on an old mountainbike. It's still my favorite, and daily driver. I'm driving to work and back about 10-12 miles a day. I've had two throttle handles fail, one clutch side drive gear bolt come loose and break my clutch cover. Many small adjustment issues, but what fun!! My second was a rack mount 2 stroke DAZ kit that I installed for my wife on a womens mountain bike. My third was a rack mount HF auger motor on a friction drive. This was installed on 15 year old Diamond back mountain bike for my 23 year old son. I also tried a Bumblebee bolt-on system, but Montana is too hilly for a light weight friction drive system. I have a 4 stroke HS system with tranny I am planning for my next project. I also have a HF 2.5 greyhound that will go either on a push trailer or some project bike. I'm a little frustrated with golden eagle belt drive system, I like the belt concept, but they are not real easy to work with, unless you have an unlimited budget.