During idle I hear engine noise!! I'm not insane and don't feel it is anything major.. But it is annoying.. Runs like a top..Can't figure it out.. The guys say they wouldn't worry about it and if something were to happen at least it is toward the end of the season,and I would have lots of time to do what I have to for next year. 2000 400EX/440 Big Bore kit/White Bros. cam/Dynojet/ported/polished/K&N air filter/stock box with holes in lid/White Bros. E-series pipe/17 front sprockett/Shredders/Douglas wheels/ Renthal bars/Maier grips and guards/(new) "SKIN GRAGHICS" and S/C.. P.S.Anyone else notice "slight" engine noise.