there 's been alot of discussion about the flapper in the air box, and i heard it wasn't a good idea to remove it unless you eliminate the exhaust valve also. Well, i've purchased a serpent system for my 954 (it's on the way),and decided to gut the air box. after it was gutted, with the stock system still on the bike, it started and ran fine at idle until it went to low idle then it kept stalling out. so i adjusted the idle and it seems to run fine. did anyone else experience this, or is something wrong?