Will Frederimo 100cc engine fit on Schwinn Ranger frame?

[hokkeyfan1999]

So I installed this engine on 98' Giant ATX 890. The bike needs a lot of restoration done mechanically. The rear derailer fell off(so no chain to pedal bike), shifter doesn't work in all gears, rear tire has blown out twice in a week and a half. The Ranger is new, never ridden. The opening in the frame where the engine would go does not look large enough. I don't want to take the engine off of ATX just to find out it won't fit. I also don't want to do any drilling of frame or fabricating. Please let me know. Thanks

 

[DAMIEN1307]

Pictures and measurements would help a whole hell of a lot...Just saying...lol.

 

[Chainlube]

Place the two bikes side by side and compare.