Hello all, I recently put back together my 2008 XR650L with a list of the following modifications done to the engine: Smog Delete Kit FMF Q4 Silencer Opened up Airbox Uni-Air Filter Lip removed from inside headers at engine flange FCR Carb Wiseco 10.5:1 102.41 mm bore piston (so now it's a 675cc pig) Hotcams stage 1 camshaft Head Ported and Polished by Trinity Racing along with 3 angle valve job Oil Cooler from GS Mark The FCR carburetor has a 178 main, 45 pilot with the screw turned out 1 3/4 turns, 45 slow jet at 500 feet ambient temp high 60's. The bike runs great and cool, since I'm able to monitor temps with my Trail Tech Voyager GPS, but bogs in very distinct situations. If I really wind it out in 5th gear, the engine will temporarily cut out. Also, if I'm at full throttle for a few seconds and start to get up high in the RPM's, chop the throttle and try to get right back into it the bike bogs for a couple seconds before picking back up. Once again the bike runs great and can pull the front wheel in 3rd, but it has these little mystery issues. I'm not sure if the spark is getting blown out or what the deal is, so I figured I'd post my story here to see if anyone has any ideas behind the cause of this bog. Any input is appreciated.