Hello thumpers... I have a '99 WR 400 that I think may need rejetting, but I am not sure what sizes to go with. I think the main is still at a 170, and pilot is stock. I have moved from Utah to Portland and now to Boise, Idaho. I have also done several mods to bike including - air box lid, gray wire, White Bros exhaust, and cut throttle stop. Right now the main symptom is the bike boggs down during the first 1/4 of giving it throttle. Occasionally it also cuts out and/or dies when I have done a hill climb and just come off the gas quickly at the top of the hill. 1) Any thoughts on what size jetting I should look at considering my mods and location (Idaho) ??? 2) Any other things I should consider in regards to the dying or cutting out after major accelerations/ hill climbs? Thanks a ton guys!