Boyesen water pump kit

Anyone tried one of these? Larger high flow impeller and a new cover. How do they work?? Does the bike run much cooler?

i've used it and i have 2 schools of thought on these things, one is at lower rpm as in tight enduro/hs they work well,making up for lack of flow. the other being at high revs such as mx/high speed off road they actually reduce cooling capacity by moving the fluid too fast and also causing turbulence along the lines of cavitation. my best results at cooling so far have come from fluidyne rads and the stock water pump. i know racers that actually shave the fins on the stock impeller to reduce the flow for improved cooling at high rpm :banghead:

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