Question about Briggs Stratton IC Horizontal OHV Engine 305cc 1450 Series 145 Gross Torque 1in x 3 2132in Shaft Model 2053320537B1

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Briggs & stratton ic ohv 14.5hp model 287707 bought used started and it dumped oil in carb and exhaust. was overfilled with oil, drained, cleaned plug. turned engine over with plug out, cleaned filter and carb, didn't remove bowl. started and burned off oil in muffler. now starts good but surges rpms, runs smooth at idle, sputters when throttled up, runs best when fully choked, checked for air leaks and put gasket sealer on carb body gaskets, still surging in mid range rpms. sometimes backfires. ????

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  • ROBERT BLACK Mar 28, 2011

    I only put gasket sealer on the plastic housing gaskets but your suggestion for removing the bowl and cleaning the jets and passages worked. Mower running like a top at all speeds. Thanks for the info !! Bob

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4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

kel1guy2002
  • 3740 Answers

SOURCE: Craftsman 42in. riding lawn mower

Hi amd welcome to FixYa, I am Kelly.
One of the things that can cause this problem is a low oil level sensor that is dirty of has beeen activated from an actual low oil level. Check the oil level to make sure it is full. Check spark... with crankcase fully serviced. Still no spark disconnect ONE wire from the low oil level sensor and test spark.
After this you will be looking at the black wire from the magneto to the ignition switch or throttle control plate. (FYI it also goes to the low oil level sensor.... start looking for shorts in the wire!) A bad magneto or igniton unit will also cause this sympton.

Parts list:
http://www.briggsandstratton.com/document/index.aspx?doc=MS3986_K_LO.pdf

Service manual OHV:
http://www.mymowerparts.com/pdf/Briggs_&_Stratton_Service_and_Repair_Manuals_Spec_Charts/276781%20Single%20Cylinder%20OHV%20BRIGGS%20&%20STRATTON.pdf
IC engine
http://www.mymowerparts.com/pdf/Briggs_&_Stratton_Service_and_Repair_Manuals_Spec_Charts/Single%20cylinder%20ohv%20repair%20manual%20BRIGGS%20&%20STRATTON.pdf

Either way there is most likely a ground on the magneto primary wire or the magneto itself has failed. Do not change the magneto until your sure there are not any grounds on the wire leading to the magneto.

Thanks for choosing FixYa,
Kelly

Posted on Apr 17, 2011

  • 147 Answers

SOURCE: Briggs 3.5hp model 94212 0319E1

Stills sounds like a carb problem to me. Did you make sure all the jets were clean and open? Some of these carbs have a main jet adjustment screw on the bottom of the carb, if yours does try opening it up a 1/4 turn at a time to richen the fuel mixture until it runs properly.

Posted on May 04, 2011

ftw1952
  • 10319 Answers

SOURCE: this engine sits atop a craftsman riding

the jets in the carburetor need to be cleaned out.

Posted on Jun 25, 2011

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