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Why does a Briggs and Stratton 4.5 HP lawn mower engine surge?

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Wiki User
2015-03-01 03:59:27

Surging is the result of a "lean" fuel mixture, meaning too much

air and not enough fuel. The problem is most likely a dirty

carburetor or an air leak in the intake system. To fix, inspect the

carburetor and intake manifold for cracks or looseness. Tighten all

fasteners to ensure all seams are airtight. Clean out the

carburetor with some carb spray and blow out all holes/orifices

with compressed air. If problem persists, carburetor must be

removed and disassembled/rebuilt.


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