B&S idle problem


Old 11-13-08, 11:17 AM
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Join Date: Nov 2008
Location: Lakeland, Florida
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B&S idle problem

I have a 19.5 horse B&s model no. 42E707 on a craftsman mower. It starts fine but will run, idle down to almost stall, run, idle down to almost stall repeatedly, worse when in gear. I have put on a new air filter, and fuel filter but no good, could this simply be old gas? or do I need to dive into the carb??

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Old 11-13-08, 06:48 PM
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That surging problem is normally a lean fuel/air mixture = dirty carb. Could be attributed to old gas. Changing the gas would be a good place to start.
Old 11-13-08, 07:17 PM
Join Date: Jan 2008
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See the other Briggs thread. I think you both have the same problem.
Old 11-13-08, 09:39 PM
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Open up the carb, clean it well, remove the main jet and clean it and the area behind it, and your problem should be solved.

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