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Craftsman Lawn Tractor popping thru carb

Posted by RickNew57 (My Page) on
Wed, May 1, 13 at 10:08

I have a 2006 Craftsman lawn tractor that is popping through the carb, this is new for the 20hp V twin Intek B&S 407577-0217-E1


Follow-Up Postings:

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RE: Craftsman Lawn Tractor popping thru carb

It is called a 'backfire' and often means the timing is way off or an intake valve is not closing (could be a bad valve spring, valve seat, slipped cam timing,etc.).


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RE: Craftsman Lawn Tractor popping thru carb

Today I adjusted the valve clearance to the factory setting and the tractor worked fine.


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RE: Craftsman Lawn Tractor popping thru carb

How did the valve adjustment get off?


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RE: Craftsman Lawn Tractor popping thru carb

The two-cylinder Briggs engines with overhead valves are well known for needing periodic and rather frequent valve adjustment.


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RE: Craftsman Lawn Tractor popping thru carb

Sounds like it is time to add a jamb nut on the valve stud.


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