Engine My Yard Machines with Briggs 28D707 engine the Carb is surging bad

micuss

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Aug 26, 2018
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  • / My Yard Machines with Briggs 28D707 engine the Carb is surging bad
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This is an old Yard Machine same as MTD 135C451E062 with a Briggs 28D707 engine it sat for years and the carb was trashed so I replaced it with https://www.amazon.com/gp/product/B074DS4K9B/ref=oh_aui_detailpage_o06_s01?ie=UTF8&psc=1 and have cleaned out the gas tank and replaced the fuel lines and filter, I have replaced the air filter as well. The engine cranks quick and runs but surges and if left to idle will eventually die out but will crank right back up and it will run under load but still surges just not as bad. Everyone was so helpful in the last post and I am not very experienced working on carbs, any and all help is appreciated.
 

bertsmobile1

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Nov 29, 2014
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  • / My Yard Machines with Briggs 28D707 engine the Carb is surging bad
Get a trigger bottle of WD 40 or similar goo.
Start the mower and spray liberally all over the carb & manifold starting at the engine end.
If you get clouds of white smoke or the engine dies then you are sucking air.
Two ways to run lean & surge,
Not enough fuel, or too much air after the carb venturi nozzel.
 
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