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B&S 42A707 carb question

12 years ago

I have a mower with a Briggs & Stratton 42A707 that stopped running. After the engine stopped running, there were two backfires and the mower wouldn't restart. While trouleshooting the cause, I discovered that the mower would run if I removed the air filter. Then it occured to me that the same thing happened last summer and the carb was rebuilt by a lawn care business. I went ahead and tried a new air filter just to rule that out and sure enough the mower wouldn't start. I tore down the carb and fuel pump, but couldn't find anything wrong to my untrained eyes. What do you think the problem is? Should I rebuild the cab again? Buy a new carb?

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Comments (2)

kilohotel
Original Author
12 years ago
Forget the guestion above. The carb wasn't the problem. The problem was a loose valve seat.
walt2002
12 years ago
Well glad you found that and not uncommon. Might want to check cooling shroud as often plugged cooling shroud causes this.

One strange thing, that engine will start and run on one cylinder??

Walt Conner
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