Recently acquired 2008 400ex, 100% stock except street legal kit and handle bar bike has never been apart very low hours still has nubs on tires previous owner says never had a problem on ridden maybe 30 times did see some sand.. had been sitting so I assumed the bogging was bad gas/dirty carb. I cleaned and oiled air filter drained tank cleaned filter, pulled jets cleaned with carb cleaner, replaced pilot with 42. resembled put fresh gas starts almost instantly will idle for ever, 1/4 throttle seems fine will even pull the front tires off the ground. at about 1/2 to 3/4 starts to bog stutter shutter what ever word you use for it. wot throttle will cause bike to stutter even more if held at 3/4 in neutral it will start to sputter continuously some white smoke then dies hit the button and it starts back up. Pump shoots a good stream gas checked ground on battery plug comes out black (obviously rich white smoke black plug) cant figure out why stock main is 148 elevation is 4500' needle is not adjustable. Any help would be greatly appreciated the weekend is coming.