It is to prevent carburetor icing in low temperatures. Carb icing occurs when the atomised fuel condenses out on the cold carburetor. It is a function of modern bikes running quite lean mixtures and can cause stalling at low speeds. Putting a bit of warmth into the carbs helps prevent icing and there are a few ways to do this. Some carbs have coolant circulating like yours, some have small electric heaters such at the Kawasaki GT550, and some have engine oil circulating such as the Yamaha Diversion 600.
Last edited by 1moremile; 27 Apr 2015 at 16:43.
Reason: Typo
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