YZ4A Thermo-Bob Kit
$129.95 – $139.90
Fits the Yamaha 2010-2013 YZ450F.
The YZ450F has no factory thermostatic control, so coolant temps can vary widely. As a result, the EFI system overfuels, because it thinks 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.
A full technical write-up when used on a Kawasaki KLR650 can be found here.
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