i'm new and was just wondering what a Bk mod was? And if it would be worth doing? Thanks all.
it allows you to fully control your accelerator pump, both in volume of fuel and the timing of actuation relative to the slide valve position.
Yes, it is very beneficial to perform this mod.
Off the showroom, the WR/YZF accelerator pump has been known to squirt fuel up to ~4 seconds. The magic number is 0.5 seconds. It has also been known to squirt the fuel down the throat of the carb, only to hit the slide valve which has not yet opened fully.
See this link: http://motoman393.thumpertalk.com/
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