Thermo-Bob 3 for YZ450F/FX: 2014 and newer, WR450 2016 and newer
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This kit fits the Yamaha YZ450F (2014 and newer) and the 2016 and newer Yamaha WR450F... please see other products for the version that fits other motorcycles.

The YZ and WR450s are popular choice as snow bikes, and in those applications, the lack of factory cooling system control leads to cold coolant temps.  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.
 
The Installation Manual can be found here.

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

WE ALSO CARRY PST ENGINE JACKETS, click below under "Related Items" to learn more.

  • Item #: TB3-YZ4B

Thermo-Bob 3 for YZ450F/FX: 2014 and newer, WR450 2016 and newer

Price: $129.00
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