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Cannot start older 8hp Craftsman Lawn Tractor


dejay99's Avatar
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07-30-14, 10:15 AM   #1  
Cannot start older 8hp Craftsman Lawn Tractor

I have an 8 hp 30" Craftsman lawn tractor model 502254211. The engine was idling fine but was surging under load. A friend decided he would adjust the carb, when I wasn't around. I believe the engine is a Briggs, and the carb has three adjustment screws counting the one on the bottom of the float. I am sure he played with all three, and now I cannot even start the machine. Any suggestions on how to get the engine running and make the required adjustments would be greatly appreciated. Thanks.

 
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Pilot Dane's Avatar
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07-30-14, 11:01 AM   #2  
The bolt on the bottom of the carburetor bowl should be screwed in all the way. It holds the fuel bowl in place. If it's not leaking then it's tight enough.

The other two screws in the carburetor are probably the idle and high speed jets. Gently screw them in all the way until they stop. Don't crank down on them. You just want to find where they stop. Then back each one out 1 1/2 turns and try starting the engine. Here is a link to the Briggs website describing the procedure in more detail.

 
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07-30-14, 01:03 PM   #3  
Post the engine model, type and trim stamped in the metal engine shroud just above the spark plug, if it is a briggs it looks like xxxxxx-xxxx-xx. Have a good one. Geo

 
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07-30-14, 06:10 PM   #4  
The numbers on the engine are 143 386122 SER7337D. Is the engine a Tecumseh rather than a Briggs? I bought the mower late last fall and I don't know anything of the history.

 
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07-30-14, 06:15 PM   #5  
Thanks for the information. Based on the reply from Geo, the engine may be a Tecumseh rather than a Briggs. The screw on the bottom of the bowl is an adjustment screw. It has a spring on it and two holes about half way up the screw.

 
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07-30-14, 06:29 PM   #6  
Since it is a Tec engine the problem is the tiny hole near the top of the bowl nut, refer to the pic below, I use the wire from a twist tie to clean it. Have a good one. Geo


 
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07-30-14, 09:35 PM   #7  
Thanks for your help. Much appreciated.

 
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