I have a Polaris sportsman 300 with a hole in the tranny case, but engines runs like a champ. I also have a polaris 250 - engine shot but everything else is in great shape. They are both the same year model and I was wondering if I can just swap engines? The only other difference between the two is that the 250 has a chain driven front end and the 300 is a shaft driven front end. Is it also possible to successfully swap out these front end drives?