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I have a cub cadet hydraulic mower tractor with a 24 HP B&S V twin professional engine with what I believe to be a fuel question. I will give you the info I have to help me. Had not run in several years, would not start unless I put gas on the carb filter would run short time and quit. So I had carb rebuilt by pro(I took off and took to them), replaced fuel pump, Finally realized that fuel hoses were bad and stopped up. Now I can start it on choke but then will only run at full throttle but it revs and slows, revs and slows, will not run at lower throttle. Any ideas ? Thanks Joe Bohannon.

jbohannon@sw.rr.com said:

I have a cub cadet hydraulic mower tractor with a 24 HP B&S V twin professional engine with what I believe to be a fuel question. I will give you the info I have to help me. Had not run in several years, would not start unless I put gas on the carb filter would run short time and quit. So I had carb rebuilt by pro(I took off and took to them), replaced fuel pump, Finally realized that fuel hoses were bad and stopped up. Now I can start it on choke but then will only run at full throttle but it revs and slows, revs and slows, will not run at lower throttle. Any ideas ? Thanks Joe Bohannon.

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First make sure you don't have a vacuum leak. (and if not) It sounds to me like the low speed circuit in the carburetor still has a problem. Dose the carburetor have a low speed air adjustment, if so check that

I agree with reynoldston, would you please post the model type and code numbers so we can see which carb you are dealing with.

Unfortunately, whenever a carburetor is rebuilt, it still can be damaged or not cleaned thoroughly.
Before anything is ever done to a carburetor, one must see if the ethanol corroded any internal parts. if you take off the bowl and see a white corrosion on the metal parts, do not waste your time, just put a new carb on the unit. if it corroded the bowl, it corroded the internal parts as well.
To properly clean a carburetor, all of the passageways, jets and needles need to be cleaned out AND chased. i do not advocate using drill bits as this will remove metal and cause that particular circuit to be changed. I do not soak carburetors, i have felt it is a waste of time. what i do is remove all that i can then start spraying cleaner through the passageways. this way i know it is clean. if possible, i remove welch plugs as well. if a passage is dirty, use a piece of copper wire (a strand from a stranded wire) and push it through the circuits. do this also with the jets.
Unfortunately, doing all of the above still does not guarantee a working carb. the ethanol will eat the metal thus changing the metering of the fuel. this is when the surging happens. Honestly, it takes extremely very little etching in the carb to make it surge. most carbs have dropped in price and are simply not worth the time to try and fix. price it out and see if it is.

The bigger the engine the higher the price for the carb. This carb will be in the $200.00 range.

And if your fuel lines were collapsing and you put a clean carb on the ned of dirty fuel lines, debris from the fuel line may have contaminated the carb depending upon the condition & placement of the fuel filter.
You could also have debris in the fuel tank plugging the outlet.
Take the fuel cap off and blow back up the fuel lines from the connection to the fuel pump.
If the mower runs properly for a while then the tank is dirty and needs to be cleaned.
The fuel line from the tank to the pump might also need replacing.

Thanks to everyone for your help so far. I have not found the problem yet but I am now certain it is in the carb somehow. Getting good flow to the carb. As one of you said I had carb rebuilt by "professional" but I still had bad fuel lines so it could be I have got debris in carb. Let me ask this. When I put carb back on engine could I have hooked up governor wrong ? Thanks again Please advise.