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These are some of the most popular bikes used in the snow, and even have a factory plastic thermostat housing with bypass - but still run cold because they have 158°F thermostats that don't totally close off radiator flow when below rated temperature. They have a large thermostat bleed hole that is fine when used as a dirt bike, but on a snow bike it becomes an issue as you just can't afford to send that much coolant flow through the radiators. The Thermo-Bob 4 is an aluminum housing with a 180°F (82°C) thermostat inside, has different temperatures available as options, and has a port for a temp sensor with a 1/8 BSPP thread.
The aluminum Thermo-Bob 4 fits in place of the factory plastic thermostat assembly.
