Snow mobil motor question?

^^ That's your man. Can turn cranks down for a clutch too. Though depending on your sled, the motor will fall under RWYB rules, not UAS, due to displacement.
 
Yeah, your sled motor (assuming it's a 2 stroke piston port) can be a maximum of 305cc to be legal for UAS. I have one that's 295cc that is a project, not sure when I'll get back to it though.
 
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