Puzzled

Ive had my White Brothers R4 pipe on for quit some time but my bike was out getting bearings put in the swingarm so i aint been able to ride it. And i was wondering this dont make sense to me, but i got the pipe put on a complete white brothers r4 and a white brothers air filter and my bike seems to be runnning rich? Ive found 2 plugs in the past week, I mean wouldnt it be lean if i did this stuff to increase the airflow? Please help

[trx400ex]

sounds like it would run lean, you didnt rejet did you? are you sure its rich and not lean now.........good luck, whens the lobo comin in:cool: latER