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I'm assuming that you are referring to your lawn mower engine fluctuating up and down (cycling) instead of running at a steady, constant speed. Fluctuations are about every one to two seconds?

My old lawn mower did this a few years back. I found that it was a clogged fuel filter or fuel line. Once I replaced the fuel filter and cleaned all the fuel lines the problem was gone. Bad (old) gas can sometimes be the culprit as well. If you leave gas in the tank during winter months when the mower is not being used its a good idea to add some fuel stabilizer to the gas tank to keep the fuel from thickening (jelling). Also, check the fuel tank for dirt/grass etc. If its a metal tank, check the inside for rust.

Good Luck!

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

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