Measure it. If you go to a chain and a sprotor, new fender and modified struts, you might be able to shoe horn it in there. The first step is to measure a 300 tire's width, out at the tire and down at the hub, then measure the swingarm to see if it's gonna fit. It's gonna take a lot of fabrication for sure and probably a little welding. A friend came to me proposing exactly this on his Coyote, but after going over what would need to be done he decided to buy a K9 frame and transfer everything over. We never got to the point of measuring the bike or I'd tell you for sure.