B&S 15.5 hp surging

Scrubcadet10

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Definitely running lean either cause of a air leak past the carb, or still, dirty carb... Could be a tiny crack in the intake manifold as well.
 

slomo

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How is the spark plug wire attached to the terminal on the plug? Looks like a bad plug wire off the magneto. That would explain the quick surge.

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StarTech

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If it was that stuck I check the terminal for rust. I have seen to rusty on the contact points. Also seen a few ternimals that simply weren't crimped as tight as they could be as I have pull then apart here too and I just crimp on a new terminal.
 
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