Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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Engine rpm is not steady.

When the engine is running in nutual or even when in gear (forward or reverse), it does not run at a steady rpm. It revs up and down no matter what the thottle is set at until the lawn mower blades are engaged. Once a load is placed on the engine, such as the engaging of the blades, it then seems to run at a steady rpm. What do we need to do?

Thank you so much for your help!

Ethelyn

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  • 7 Answers

Sounds like the spring on the carburator butterfly valve is weak ... when at idel it surges the engine but when the blade is enguaged the engine evens out

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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