I rebuilt my carbs because the bike was running terribly without having the choke on half way. When I just start it and rev it up it bogs down and backfires and the bike won't go over 45 mph. I rebuilt the carbs and replaced the primary jets with larger jets cause the carb kit I purchased from (Sigma y) said with the YOSHI pipe I should have larger jets but the bike runs worse now with the larger jets but the bike still seems like its starving for fuel and backfires and is bogging down once I get to 4 to 6000 rpm. Adjusted mixture screw as well. I've owned this bike for about 6 months and have not been able to ride the bike since the carb rebuild. I rebuilt 3 times and a Suzuki tech rebuilt them 3 times as well. Getting ready to have a bonfire and roll the bike in lol. Any suggestions would be greatly appreciated

2004 Suzuki GSX600F Katana
12k miles
Only mod is a Yoshi pipe.

 

This seems to be the most active forum but I'll give it a shot.
I have older 750F (and other oil cooled Suzukis), it is quite same.

Did you check diagrams, all intake leaks (intake boots, etc)?

Sounds like it's running lean.

Mixture screw is applicable mostly on idle and 1/8 part of throttle position.

Do you have TPS sensor in your carbs already, can't remember if it was fitted in GSXF models.

 

Have you checked your rubber inside carbs for small rips tears pinholes..and what are your needle settings at 1 2 3 ECT notches