Lawn Mowers, Carburetors & String Trimmers

What is the cause of a lawn mower engine 'surging' (hunting up and down in RPM rhythmically at idle)?

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 Correct IncorrectA clogged pilot/idle jet in the carburetor causing a lean condition; the mechanical governor compensates by opening the throttle, over-revving, and repeating in an endless oscillating wave.

What is the cause of a lawn mower engine 'surging' (hunting up and down in RPM rhythmically at idle)?

• A partially clogged carburetor pilot jet causing a lean cycle that the mechanical governor continually hunts to correct
• The fuel tank is 100% full
• The muffler is painted black
• The blade is spinning too fast