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'01 yz250f: Switch fuel spray from 4 to 1 seconds ?

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Just got '01 yz250f with '03 autocam. Has been easy to start hot or cold. Highly recommend it. *Previous owner got web info to install a small screw on the outside edge of the black side cover of this carb to switch fuel spray from 4 to 1 seconds. *Anybody have a good link to read?

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I think you are referring to the BK mod. This is used to shorten the squirt duration of the accelerator pump to tune out the annoying 4 stroke bog that happens when you wick the throttle suddenly wide open. I know newer bikes can accomplish the same thing by selecting a different leak jet, but I don't know if yours has a leak jet. Since the BK mod is already done, you should probably go ahead and use it to adjust the AP squirt.

Here's a link to read up on.

http://www.thumperfaq.com/ap_mods.htm#BK

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