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Maintaining Snow Bike Engine Temperature One of the root problem s is that most dirt bikes being converted to snow bikes don’t have a thermostat. Dirt bikes were originally designed to be run in hot environments where you need maximum cooling without restriction. When being used as a snow bike the coolant system overpowers the BTU output of the engine, resulting in a cold engine. The OEM ECU monitors the engine coolant temperature and bases many aspects of the engine calibrations on it. When the fuel and intake tract are very cold, the atomization of the fuel is not as efficient. Fuel droplets pool in the intake track or on top of the piston. Th is negatively effects the efficiency of the combustion chamber. Not only does the engine coolant temperature need to maintain its target temperature, but so does the engine oil. In all gasoline engines a small amount of fuel gets past the piston rings and ends up in the engine oil — especially in stock snow bikes run for long periods with cold coolant and oil. When the engine oil temperature is at proper operating temperature, the oil flashes off any fuel found in the oil. If the oil isn’t at operating temperature the crankcase will slowly fill with fuel, and over long runs — like those in the cold mountains — the engine can hydro lock. Some snow bikers have already experienced this situation. This problem gets exaggerated because the ECU commands a richer fuel mixture when it sees a cold coolant reading. The OEM does this for many reasons such as combating 4 point seizures on the piston from not letting the engine warm up. So when riding a stock snow bike without a thermostat, in typical cold conditions, you will have an extremely rich air/fuel ratio — causing horrible fuel consumption, calibrations tables limiting maximum horsepower, and risk severe engine failure from fuel thinning out the engine oil. Or a seizure. Our fix: Install a thermostat and maintain a consistent target engine temp. How a Thermostat Works — The type of thermostat we are talking about is a mechanical auto adjusting valve that restricts the flow of the coolant system. A properly selected thermostat is what controls and maintains a liquid cooled combustion engine’s operating temperature. When the engine coolant is cold, the valve is closed. Once the engine gets up to operating temperature, the valve opens a little, and starts to allow coolant to flow to the radiator. When the engine is hot the valve opens more, allowing the coolant to flow through the radiator to dissipate excess heat. As the engine heats up or cools off , due to environment or work load, the valve self-adjusts to maintain a targeted 180°F, the proper engine temperature.