If you use gas in the cylinders, use premix! Putting straight gas in the cylinders of a 2 stroke isn't a good thing. I mix a little bit in a bottle with a smaller nozzle on the end, then keep it stored in the garage if I need it to get a sled going. Ether works but get the kind with upper cylinder lubricant, otherwise it's also not good for anything.
1974 Arctic Cat Cheetah 340
Gonna be set up for ice fishing. Should be good for it's purpose!
Most snowmobile problems are caused by a loose nut connecting the handlebars to the seat.