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Wow old thread! But I might as well chime in... As the owner of 2 yamahas in a state that gets really cold, almost every starting problem can be traced back to your carb. If it isn't perfectly clean, cold weather starting sucks. Both of my sleds will start in -20 nearly as well as +20. Worst case, if it has been sitting quite a while, is a shot of 2 stroke fuel down into the carb tubes in the airbox. (mixed 2 stroke gas is better than starting fluid on the engine)
 
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