Can you change a 2 stroke bike to a 4 stroke bike?

2 strokes are smaller and lighter than the 4's, but if you can make it fit there is no reason you cant swap them out. The electrical syatem will be different though so you had better bring the wiring harness and exhaust over from the donor bike. with all the work involved you would be better off selling the 2 and buying a used 4.