GSX1100 Running Rich After Carb Rebuild

[catherinebennett]

Hello

I recently rebuilt the carbs on my GSX1100 and now the bike is running extremely rich. It starts fine but bogs down under throttle & the plugs are coming out black and sooty. I set the float heights to spec and checked the jets, but something still seems off. I've tried adjusting the mixture screws, but the issue persists.

I suspect it could be a combination of jetting and needle height; but I’m not sure if I should go leaner on the main jet or focus more on the pilot circuit. Could the needle position be causing the rich condition at mid-throttle? Also, would a different float height mongodb setting help lean it out? 

If anyone has experience fine-tuning these carbs; I’d appreciate any advice. I’m especially curious if others have found an ideal setup for similar air-cooled GSX models. Any input on troubleshooting or common mistakes would be great!

 

 

Thank you !

Edited February 2, 2025 by catherinebennett
Removed suspicious link

[Gixer1460]

As you've probably disturbed everything, anything is possible. The manuals settings basically assume new or un-worn components but old used components will have 'worn into place' and disturbing them messes that up! The float valves may be slightly leaking causing a rich condition, incorrect needle position can certainly cause a rich . . . . or a lean condition, other outside influences - exhaust, air filter etc can mess with fresh built carbs! Every bike is individual, there are no 'ideal' set-ups only ball park tunes to get close!

[BigT]

Did you completely disassemble them?

Did you replace the O rings?

Did you use kits?

[Guest]