hey guys I got an 01 yz 426 and it needed an accelerator pump, so I ordered on, put it on and while I was in my shade tree mechanic ear tuning mode I decided to adjust my fuel mixture screw while I was at it because it wasn't very snappy. now my leg wants to fall off every time I start it cold, and if I start it after a couple motos and it has been on the stand for 30 minutes it runs like crap and is popping and bogging down. once I rev it up a few times and get it going finally its fine on the track, no hestitation or bog. I have the mixture screw set at exactly 2 turns out. it has an FMF power bomb header and some ugly FMF pipe that says titanium something or other. it takes a lot of throttle to take off when its doing this too or it will stall. but any other time its normal. thanks guys!