Thermo-Bob 3 for CRF450X (not RX):2005-18, 450R: 2002-2008
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This kit is for 2002-2008 CRF450Rs and 2005-2018 CRF450Xs... please see other products for the version that fits other motorcycles.

We've seen our share of CRF450s used as a snow bike, and in those applications, the lack of factory cooling system control leads to cold coolant temps.  These carbureted bikes then have inconsistent jetting.  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.

The Installation Manual can be found here.

A full technical write-up when used on a Kawasaki KLR650 can be found here.

  • Item #: TB3-CR4A

Thermo-Bob 3 for CRF450X (not RX):2005-18, 450R: 2002-2008

Price: $129.00
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