e top end power as it did cranks well but backfires at shutdown
Garden
Experienced gardeners share their insights in answering this question :
Check to be sure both cylinders are firing. Did you change gap on magneto perhaps? Is one kill wire grounded on one side? Backfire could be caused by unburned fuel left over from one cylinder not firiing. One mag could have failed.
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Gasoline that contains alcohol has a tendency to ignite easier, which can cause afterfire. Small engine muffler type and manufacture. Carburetor adjustment may not be properly set for correct engine performance. Anti-afterfire solenoid may not be working properly.
You Lose Power in the Middle of Mowing:
Here`s why this happens and what you can do: Dirty Air Filter on Your Lawn Mower: Clean or replace. Dirty Spark Plug: Clean or replace. Build Up of Clippings & Debris: Clean underside of your lawn mower deck as noted above.
Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start. For small engines, spark plugs typically need to be replaced every season or after 25 hours of use. You should also check to make sure the spark plug gap is set correctly.
There are a few common causes that cause engines to backfire: damaged valves, bad ignition timing, or an air/fuel mixture that`s not quite right. backfires happen when your vehicle`s air/fuel mixture combusts outside its designated spot in the engine`s cylinders.
The spark inside the chamber may not burn up all the fuel, allowing a little extra gasoline vapor to enter the exhaust, and lead to a backfire. This can be caused by a faulty mass airflow sensor or a clogged engine air filter “choking” the engine and not allowing enough oxygen to flow into it.
The most likely issue is that a component is clogged. A clogged fuel filter is the most common reason, although a loss of power in your car could also indicate problems with the fuel pump or fuel line. Impurities or debris may be blocking the system, which causes the loss of power in a car.
If your lawnmower is starting and then stalling, the most likely issue is the carburetor. The most common issue is that the carburetor is dirty. Here`s what you need to know about how a dirty carburetor can cause a lawnmower to start, then stall out and die.
Another possible cause of your backfire is a spark plug refusing to “spark” when the exhaust valve opens. If the air/fuel mixture has become too rich, unburned fuel is left in the exhaust system. The misfired spark plug ignites the rich air/fuel mixture, causing a loud “bang” in the tail pipe.
Discover Relevant Questions and Answers for Your Specific Issue
the most relevant questions and answers related to your specific issue
Battery the battery is dying and it will start but, after a few mins the engine starts to sputter then goes back to idle and eventually dies. could this just be the dead battery? is that the reason the engine dies?
ANSWER : Usually, if the battery is dying, it won’t start up again.
Usually, motorized vehicles only use the battery to start the engine, then the alternator contributes all the power for actual operation.
A dead alternator or battery shouldn’t ‘sputter’, they would just stop dead.
Usually, motorized vehicles only use the battery to start the engine, then the alternator contributes all the power for actual operation.
A dead alternator or battery shouldn’t ‘sputter’, they would just stop dead.
If the engine will start, run and then sputter…there is a fuel problem.
1. There may be a ‘cut-off’ in the fuel line which is in the off postion. It may look like a thin, flat wing-nut.
2. The gas may be contaminated with water residue if the gasoline has been sitting a long time. I believe you can get some water treatment to fix this without having to dump the fuel tank contents.
3. The fuel line is blocked with dirt somewhere, I would check the fuel filter and work backwards from there.
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How do I remove and clean air filter? – Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower
ANSWER : There should be a square of plastic on the side of the engine which is opposite of the muffler. It has a small hex head with a slot cut in it. Remove this plastic cover and the air cleaner should be inside of it.
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Backfires and will not start – Parks Optical 13.5hp Briggs And Stratton Intek Lawn Mower Engine
ANSWER : Be more specific make sure your motor has an exhaust the motor should be sucking in fuel and you might want to rev the motor as soon as you start it
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I have a 12.5 Briggs & Stratton and I can not get the timing marks on the crankshaft and cam gear to line up when the piston is at top dead center.
ANSWER : Timing on briggs is piston past tdc by 6mm….also see if you are 360deg out?
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<!– from fixya rte –>Backfire, and will not restart – Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block
ANSWER : Lost valve seat my have to short block engine take in for valve job but be prepared if thet say your need a short block valve job 150 .00 to 200.00 short block 600.00 tp 800.00 dallars
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Wshat is the valve clearence for a 24 hp briggs and stratton engine model 446677 type 0470E1 code 050405yh
ANSWER : About a mm or .004″.
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I see no vent holes om my 675 series briggs and stratton engine fuel cap
ANSWER : There are holes in it should be three or four. a rubber diaphram is covering it but they are there
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I have a briggs v twin model# 407577 type 0027E1 the battery kept going dead so i replaced alternator now engine skips at idle and does not have top end power as it did cranks well but backfires at shutdown
ANSWER : Check to be sure both cylinders are firing. Did you change gap on magneto perhaps? Is one kill wire grounded on one side? Backfire could be caused by unburned fuel left over from one cylinder not firiing. One mag could have failed.
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