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bk mod

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Its a way to adjust the timing and volume of the squirt for the accelerator pump,eg water pistol type squirt of fuel into the engine to compensate sudden

throttle inputs,its now easier to just use the right size leak jet,bigger number the less fuel in squirted in.The older carbs did not have a leak jet so a bolt was fitted to the link to adjust by the length of the bolt the travel of the link

on the pump.

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FYI,

A BK mod is old school. Earlier carbs came without the accel pump screw shown above. The BK mod, as it was called, was to drill a hole and tap it for a screw just like it is shown above so you could externally adjust the duration of the squirt.

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It is an incredibly complicated little squirt gun actually. If the AP screw is between 2 & 3 mm the the BK mod can be set such it would limit the stroke of the pump - simulating a longer stud on the AP diaphragm.

For general riding the factory settings work pretty good - just put in your favorite size leak jet.

.

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