What size needle is stock for a 2001 YZ426? Mine has the OBEKR and I am struggling with jetting, unable to eliminate the off idle bog. Tried everything between 40-48 pilot, all needle clip settings on the OBEKR, 160-172 main, and have done the BK mod. I just rebuilt the motor top to bottom, starts easy and runs strong but will die with a quick stab on the throttle, whether its on the stand or on the road. It seems a different needle is the only thing left to try.