bk mod problems

I just finished doing the bk mod and it hasn't cured the bog when I open the throttle quickly. I have tried adjusting it both ways and think I have the best response now. Adjusting the fuel screw also doesn't seem to help. It definately responds better when the throttle is opened, but the bog is still there. When opening the throttle from anywhere above 1/3 the response is great. What else can I try to fix this problem? The bike is an '00 yz426 that is all stock. I don't know what the jetting is, but can check if need be. I ride between 2500 - 4000 feet elevation.



It will definitely help to know all jets, pilot jets, and needles. I would think the pilot is the wrong size by what you have described, mostly because you stated the "fuel screw does nothing" This is ususally the case if the pilot is out of range. I would personally buy the JD Jetting kit and be happy. You can get there other ways but it will take a bit of trial and error. Have you posted in the jetting forum?

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