It is a possibility that the motor may fit, but the trouble you will experience is radiator(s), exhaust, intake, etc. The whole wiring harness would have to be swapped if thats the coil you speak of. I'm in the middle of swapping a kx80 engine into a kx60 and it fits very well, but I am having troubles figuring out the exhaust and radiator. I will probably have to run a stock kx60 radiator and for the exhaust I am not totally sure yet. All this is let alone the fact that it will be very sketchy, but still cool. I am thinking that this 80 engine will be kinda sketchy.