Started working on the skyliner (after an spending the morning walking around the arts&crafts show) and when I took the motor off, I found the seat tube was badly cracked. Almost all the way around.
Clearly, I could use this as a peddle bike but is it still usable for motoring? I remember reading in one of our threads the suggestion that a sawn-off seat mounting tube could be forced to the bottom of the frame seat tube to reinforce it. I've got plenty of old parts. The crack is pretty low on the frame as you can see from the pictures