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B&S Carburetor issue 20.5hp craftsman riding

2919 Views 2 Replies 2 Participants Last post by  Jonesie
Good day,

I have a 1999 Craftsman 46 in, with a B&S 20.5 "twin turbo cylinder" (4077770122E1)
This tractor has preformed great over the last 13 years with no major repairs.
A issue a just came up where it will not start.
Turns over, spark plugs sparking.
After breaking it down and back tracking issues, I've concluded that I must have some type of Carb issue.
I've pulled the fuel hose that goes on top of the Carb, which by the way is pumping fuel to the carb, but not firing it up.
However, when I dump a little fuel into the air inlet on the carb it will fire up briefly.
This leads me to believe that it has something to do with the carb, or more specifically the float bowl.
I had read a earlier article that said you could check out the solenoid on the bottom of the float bowl by taking a 9V battery to see if the solenoid was working. It was. So I'm not sure what the issue is.
I'm guessing this is a candidate for a carb rebuild, however I don't want to go through all the mess of doing that myself.
I'm looking for an easy fix that's quick.
Could replacing the float bowl internals be a solution? Is there some type of diaphragm that could be broken in there?
I'm at a loss at this point and any help would be greatly appreciated.
Thanks in advance,


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If You have had this many years of good service without any carb problem You are Blesed. How ever check for a hole in float. or possibly tare down carb. and blow air thru all holes. There are some good videos on Youtube explaining about any size or brand.
Thanks for the reply. Yeah...., was hoping for an easier answer.
Guess I'll order a rebuild kit for the carb, but I'l think ill monkey around with the float bowl a bit to see if I can get any life out of it before I do.

Thanks again

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