I used a Huffy Cruiser I got from Sears and the only mods I had to make were cutting away a section of the rear fender so the chain would clear and adding a plate to the motor mount to work around the part of the frame that was too large. Minor stuff! The best bike is the one you have! (As long as the engine fits!)

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If it can't be broken I'll find a way!

-and-

I'm not lost, I'm exploring!