A number of the newer sleds are now fitted with “carb heatersâ€. Many of these route warm engine coolant through the carb body in an attempt to prevent icing of the carbs (and the resulting safety concern of a stuck throttle).
Sleds equipped with these systems typically have a valve to turn the flow of warm coolant to the carbs on and off. Normally you want the valve off for maximum performance (colder air intake temperature), but Ski-Doo tells us anytime you’re riding where there is snow in the air (riding in powder or behind a sled creating snow dust) or when the relative humidity is quite high and the air is rather warm (-5 C to 5 C, or 23 F to 41 F) you want the valve ON. Be sure to turn the valve OFF once the riding temps get any warmer than this.
