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Briggs and Stratton runs on full choke


Phelpo's Avatar
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09-21-11, 03:10 PM   #1  
Briggs and Stratton runs on full choke

New guy here, great site. I own a sears rider with a B/S 20.5 hp
twin cyl, model 461707-0145-Ea motor. Starts fine and after 10-
15 minutes of cutting I need to full choke it or it will die. Have
replaced fuel filter, opened up the fuel tank cap, cleaned out
the tank, new fuel, sprayed cleaned in the top of the carb and
Cleaned the air filter.

What would cause it to need more fuel when it gets hot?

Thanks to all

Phelpo

 
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09-21-11, 08:10 PM   #2  
did you make sure the line from tank to filter/shut off is clean and shut off has no crap in it.

 
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09-22-11, 05:53 AM   #3  
yes and there is no shut off, this has been an issue for some
time, I had replaced the lines a few yrs ago.
what is the cost of a new carb?

Phelpo

 
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09-22-11, 07:21 AM   #4  
does it have the the anti backfire solenoid on the carb?

 
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09-22-11, 08:29 AM   #5  
that 38 I do not know, what does it look like? this mower is over 15 yrs old.

Phelpo

 
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09-22-11, 08:35 AM   #6  
I looked at sears diagram and it has a spark arrestor on it, didn't see
a anti back fire anything

Phelpo

 
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09-22-11, 03:09 PM   #7  
The spark arrestor would be in the muffler. The shutoff solenoid for back firing is on the carburetor bowl. It would have a wire running to it and would be battery fed.

 
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09-22-11, 03:24 PM   #8  
Just for a goof, Try it with the fuel cap loose. If the vent in the cap is plugged, it makes them act as if they are running out of fuel after several mins running..... Roger

 
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09-22-11, 05:54 PM   #9  
I took the cap off totally and still it needed to be fully choked.

 
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09-22-11, 06:00 PM   #10  
how can the backfire solenoid effect the running of the motor

 
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09-22-11, 06:38 PM   #11  
It's a fuel shutoff solenoid. It blocks a backfire from coming back through the carburetor and creating fire hazard.

 
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09-22-11, 08:58 PM   #12  
Sounds to me like the carb is still plugged up somewhere.


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