how does a lt 80 with a cr80,kx80,rm80,yz85 engine with it and mabey a fitted durablue axle in the rear and some houser a -arms?

 

It would be a tough swap,the factory engine set up is actually part of the rear swing arm,moves with it,pivots up by the foot pegs. You would have to fab a subframe to hold the new motor,then add a swing arm,by the time you were done,you'd be rebuilding almost the whole frame. And the front is only single a arms,you could fab up brackets for dual set up,but then again, the time and money getting that to fit would buy a mini race quad ready made.