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Darned lawnmower won't start!

Calion -

Briggs and Stratton 675 Series Repair

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How to clean and maintain your Briggs and Stratton 675 Series Carburetor

20 minutes

Moderate

Mon problème

Of course, I waited too long to mow my lawn. It was getting so high I feared the city would complain, so I waited for a cool dry evening and dragged out my trusty Troy-Bilt push mower with the Briggs and Stratton 675 Series engine. I made one lap around the lawn when the thing died. It had very little gas, so I refilled it. No dice—it would start for one or two seconds, then die, over and over again. After enough attempts, it began to not start at all unless I left it alone for several hours, then it would again start for a couple seconds, then die, and then refuse to start at all for several more hours. What to do? The grass is getting higher!

Ma solution

I tried several resources to get this thing fixed. I bought the Haynes Small Engine Repair manual (from 1990, no less); no help. It suggested several things that did not seem directly related to my problem. I went to the Briggs and Stratton FAQ; it suggested that the problem was stale gas. The gas I was using was left over from last season; apparently that's not okay. So I bought a siphon, emptied the fuel in the tank, and filled it with fresh gasoline I bought that day. No luck, even after many pulls and leaving it overnight. In desperation, I turn to the Internet again. I had read somewhere (the Briggs and Stratton site?) that cleaning the nozzles at the bottom of the carburetor could solve this problem. I followed this Guide to disassemble the carburetor to get to those nozzles, cleaned them with carburetor cleaner, and it started up and ran like a dream!

Mon conseil

Make sure you clamp the fuel line before taking the carburetor apart! Otherwise you will get fuel everywhere. Luckily another site informed me of this. Also, make sure you clean the nozzles in the screw that comes off the bottom of the carburetor—that's what actually needs cleaned, more than the float tank itself.

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Thanks for the info. Last year my lawnmower of 10 years dies and I was told it was not recoverable. In a moment of panic at hearing the cost of a new one I bought a second hand one in the hope that it would last the season. I picked up a book on small engines and also surfed around the Briggs and Stratton site. Lots of info out there. A success story like yours gives me motivation to tackle my machine in the spring and hopefully keep it going for years to come. thanks.

Fintan Keogh - Réponse

Also be careful of the gasket that seals the bowl to the carb: it usually stretches out when you remove the bowl. Also moisture in the gas will turn into a jelly like substance, clogging the carb jet. Old gas works just fine in a low compression lawn mower, as long as its not moisture laden. Fresh gas is clear. Sometimes just removing the screw jet on the bottom and cleaning is enough without removing the bowl.

steve - Réponse

I'd like to also recommend that any time you have gas powered equipment, that before putting it away for storage, you fill it up with fresh fuel mixed with the proper ratio of STA-BIL or equivalent fuel stabilizer, then run for a bit. This will prevent the fuel from going bad and clogging your system.

mgardiner - Réponse

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