Any other WR 400/426 owners have the dreaded bog when you stab the throttle right off idle. My bike is jetted right and runs near perfect. No problems starting, fouling plugs or running too lean and whitening the plug tips. It just bogs when I open the throttle too quickly off idle. I was told it was an accelerator pump problem that some of the older (before 2003) bikes have. Any suggestions on how to fix this???? Mine is a 2002.