hmmm....i cant say for certain whether it will or wont, but here's a pic that might help.
i ran a tape midway up the engine (where the mid point of the frame opening might be). if you have 7 inches, that may not be enough. from the front of the jug, to the rear of air intake was a little over 8 inches.
try it. the worst that can happen is that it wont fit.[/QUOTE] Thank you for the pic. I saw this on BikeBerry.com and it looks grim

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80cc engine kit is about 12" height 10" length 5" width. Kit fits on standard 25mm 29mm frame tube. Larger frame size requires drilling into bike frame and use the universal face plate.
Since i can't afford my motor till after X-MAS I was hoping to remove rust, sand, paint, fill dents etc on the Schwinn frame and fenders before then. If the motor won't fit it will be all for nothing. I also have a Huffy Surfside that needs lots of work, it was left outside forever and is all rust. . Maybe ill get started on that and use that as a donor. I am sure that frame is large enough but is the Huffy garbage*?