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The lawn mower keeps misfiring, can't adjust mix?

The lawn mower has started to misfire and throw out black smoke. I have cleaned the filter, new spark plug but there doesn't appear to have an adjustment screw to adjust the mix?

Laine
April 2009

Garden Tools, Lawn Mowers Mower Black Smoke

If it's a briggs engine with the carb on the tank, replace the diaphragm. Easy & cheap.

Phil Saunders
April 2009

The only usual adjustment is for the pilot mixture, which may be a tamperproof screw on the side of the carburettor. However it sounds to be a bit more than this. Is the choke sticking on? If the air filter is a paper one - dont clean, but replace it.

John
April 2009

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The lawn mower keeps misfiring, can't adjust mix?

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The lawn mower keeps misfiring, can't adjust mix?

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The lawn mower keeps misfiring, can't adjust mix?

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