I picked up a "Sno Shrew" motorcycle to Snowmobile conversion kit, like the ones you saw in magazines as a kid (depending on how old you are I guess). I believe it was made in Illinois sometime in the 70's. My neighbor got it in a trade and never mounted it. I had this 1979 Yamaha YZ 125 that was begging to be put to use, so a 300cc Rotax on the back and torque converter drive made it a good giggle to ride.