KX4 Thermo-Bob Kit


This kit is for 2006 and newer Kawasaki KX 450Fs, and also fits all years of the KLX450.

Add Spare Thermostat * 

The Thermostat is the only consumable in the system, some people get one now for the future.


The KX450F is a popular choice as a snow bike, and since there is no factory thermostatic control, coolant temps can vary widely.  The EFI system ends out overfueling, 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 coolant flowing all the time through the engine, but not through the radiators until it is up to a selected temperature.

There is also a threaded port in the Thermo-Bob 3 that will accept aftermarket temperature gauges such as the KOSO or TRAIL TECH 1/8-28 BSPP temperature sending units.
A full technical write-up when used on a Kawasaki KLR650 can be found here.


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