Craftsman Lawn Tractor popping thru carb

RickNew57May 1, 2013

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

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brickeyee

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.).

    Bookmark   May 1, 2013 at 1:51PM
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RickNew57

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

    Bookmark   May 1, 2013 at 6:41PM
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brickeyee

How did the valve adjustment get off?

    Bookmark   May 15, 2013 at 12:10PM
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bus_driver

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

    Bookmark   May 17, 2013 at 9:26AM
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brickeyee

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

    Bookmark   May 17, 2013 at 9:45AM
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