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About cashdman

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  1. cashdman

    400 injector pump bk mod

    I just performed the BK mod to my 2000 WR400F on Sunday. Detailed instructions can be found within these forums or in the 250F FAQ's. Once you find good specific instructions and remove the throttle cable cam cover from the side of your carb to reveal the accelerator pump linkage, it will be obvious where to drill the hole and how the mod changes the duration of the AP squirt by providing a mechanical stop for the linkage. The mod is very simple. Good luck, DC