B&S 6.5 mower surging

Old 08-04-19, 01:37 PM
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Join Date: Nov 2007
Location: MI
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B&S 6.5 mower surging

I replaced the worn out carb on my Craftsman mower and now I have a new problem.
It starts fine & runs good for a little bit but it seems like movement of the mower will cause the speed to begin surging, and then it doesn't stop.
The carb used on this mower has no throttle, and no adjustments.

The governor spring & linkages are clean & undamaged. I don't have a tach but it sounds right.

So...new carb, fuel line & air filter. I don't know what else to try.
Old 08-04-19, 07:06 PM
Join Date: May 2006
Location: Iowa!!!!!
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May be an air leak. Check the mounting screws and if nothing obvious there spray some WD40 around the carb when it's running to see if the rpms change.

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