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Backfires through the air cleaner

Won't start and backfires through the air cleaner.
Gasoline and sparkplugs are new.
Briggs and stratton engine on a push mower.

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Your alluminum shear pin has sheared, you will have to remove your flywheel and replace the key they cost about 25 cents, I hope this helps

Posted on Sep 30, 2009

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This usually means a bent or sheared key in the flywheel. Remove the shroud exposing the flywheel buy a 6" flywheel puller and remove the nut for the flywheel and attach the three jaw puller remove the flywheel and replace the flywheel key. The only other thing that causes this popping through the carb is a burnt intake valve this is a job for a lawn mower shop.

Posted on Sep 30, 2009

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I have a Briggs Stratton 17.5 it backfired now won't start . now blowing gas out carb


sounds as you need to do a compression ck on the heads to see if you have a blown head gasket, If it does let me save you a lot of time n money don;t go 4 the head resurface and new gasket it won;t last long briggs sells a "short block" thats your best bet !!!!!

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I have a briggs & Stratton 675 series engine in a Craftsman front wheel drive rotary mower which won't start. It was fully serviced and used 3 times this season but now it won't start. It


if it has hit a object, the flywleel key is partially sheared, and needs to be replaced. they are very inexpensive,CHEAP. this will through the engine out of time just enough it wont start.

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Try posting this question under mowers. This is the measurement tools category.

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3 most common possibilities: Most gas mower carburetors have a tiny hole for the fuel to rise into the vacuum venturi throat of the intake. The hole in this riser tube which goes down the center of your float chamber to the area where the fuel sits in the bowl is only about as big as dental floss. Take the tine of a wire brush to clear it of crystallized or varnished gasoline and oxidized pot metal tube crust. When they make stainless carburetors, it will eliminate half of the heart attacks caused by this problem. Additives and condensation that settle out in old gas also can lead to clogging. Another very common problem is shearing the aluminum alignment pin in the top of the crankshaft when the mower whacks a log, root or rock. The inertia splits the alignment pin in half and throws spark timing off. So it backfires or won't run. Also check your spark by grounding the fat end of the sparkplug with a jumper cable to the engine casing, leave it plugged to the wire and pull the cord to see if it is firing. Keep spark away from fuel. Ignition points in some small engines get crusty when sitting in humid conditions. So they have to be filed clean of oxidation for proper contact and sparkplug operation. Small engines like rich mixtures and starting fluid when they are cold.

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trry a shot of starting fliud see if it wont start then make sure your getting a spark to

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Had the same problem with an almost new Craftsman w/ Intek 20.0 HP. Check all the "usual suspects" and had to have a tech come out. He had me start it. It ran for a few minutes and stopped (per usual). He immediately went to the Anti-Backfire solenoid. It is an electrically operated "plunger-style" fuel line blocker. They are famous for going bad. The part is about $65 and its sole purpose is to starve the engine of its fuel supply at shutdown so it won't backfire. If it is disabled, the user must throttle the engine down for 10 seconds or so before turning the key off in order to avoid backfires. Gee... let's see, 10 seconds of my time each time I use the mower vs $65 part ... No contest! Remove the solenoid, take a pair of electrician side cutters and snip off the tip of the plunger and reinstall it. Problem solved ! ! !

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I recommend  Jack's Small Engine Repair; they have always had the detail part I needed and their prices are among the lowest.
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Jack's

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