Fuel Cub Cadet 50" ZTR with Kohler command 23 hp running rich at higher rpm

[lakelover49]

My 2005 CC is running extra rich and puffing black smoke as you increase the throttle. I have rebuilt the carb (keihn) put all new hoses and drained the tank and dried it completely. I found a large amount of water in gas early on, but is no longer a problem. I use only non ethenol gas all the time. I have taken carb off several times and cannot solve problem and I changed fuel filter. I can get some mowing time by adjusting the gas flow using the cut off on the fuel tank, but is almost a constant thing to keep it running. When it is running as it should for short intervals it is as strong as ever. I have not replaced the fuel pump, but it is getting way too much fuel already.
My only guess is that it is something to do with float in carb. I have checed it for leaks. I replaces needle seet valve,and it made no difference.
Any body have any suggestions?

 

[Rivets]

I'm assuming that your engine is a CV23. If so this manual might help you. I would check the float needle and seat, as they may not be sealing properly,may need to replace. Also, check the float level.

http://www.mymowerparts.com/pdf/Koh...d-CV17-CV18-CV20-CV22-CV25-CV22-CV23-CV26.pdf

 

[fireman9513]

You didn't say if you replaced the air filter or not, if it is plugged up it will run to rich. You can't just look at it and tell if it is either.