Seller notes

This kit is for the 2021 and newer CRF450R and CRF450RX, which have no factory thermostatic control. Without any factory thermostatic control, coolant temperatures vary widely. These engines have EFI – and when used on a snowbike, the system then overfuels, thinking the bike is constantly in ‘warm-up’ mode. The Thermo-Bob 3 is a machined aluminum housing with a 180°F (82°C) thermostat inside, and modifies your cooling system to operate like automotive systems have for decades… keeping ...

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