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I have a 05 400ex jus put procomp exhaust k n filter and dyno jet kit...adjusted fuel screw as instructed took it for a ride and when u go to give it a lot of throttle it Boggs down
 

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Install a bigger main jet - just installing a kit is not a fix, but it is a good start. Note: the fuel screw does not have a finite setting - the suggested setting is a starting point - ride the vehicle for about 15 to 20 minutes and set the fuel screw as prescribed by Honda - turn it in by 1/8 turn increments, pausing for 5 to 10 seconds between changes, until the engine rpms drop by 50, then back the screw out one full turn. The fuel screw affects idle only - it will not compensate for any other throttle setting.
 
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