It doesn't matter. My XR650R got very hot on hard, tight trails. If you're not going fast enough to force air through the radiator, my bike will get hot fast. I've combined this with Engine Ice Coolant and it makes a world of difference. The fan doesn't draw much voltage from my stator and I hardly notice it turning on. If you are fitting this on a 650R you MUST remove the radiator on the right hand side and get creative. The manual does not give any advice.
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