I have run Boyesen Supercooler kits on my bikes for years. A very well engineered water pump housing and impeller kit that is bound to bring the temperatures down on any bike. And 4 strokes run hot! So why not keep your dirt bike running cooler if there is an easy and fairly reasonably priced option to do so?
This is a comparison between the stock the the Boyesen pumps that shows the details and differences between them.

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