YT 4000 42″ Briggs Stratton 24 hp Gas Powered Riding Lawn…

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Common Causes of 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.

Low fuel pressure can cause a backfire when there`s too much air and not enough fuel in the combustion chamber. This can be rectified on lawn mowers with speed settings by simply increasing the speed and thus increasing the fuel supply. Another possible cause is a failing fuel pump or even an old fuel filter.
Rich Air/Fuel Mixture

If too much fuel is added to the engine, it may not all burn up before the exhaust valves open — letting unburned gasoline into the red-hot exhaust headers, where it can combust and lead to a backfire.

When an engine is running rich, it has too much fuel and too little air, which slows down the combustion process. When combustion doesn`t happen in a timely manner, the exhaust valve opens while the air-fuel mixture is still igniting, causing this explosion to “spill” out of the cylinder, making a loud popping noise.
Not only can a rich air/fuel ratio cause a backfire, a mixture that doesn`t have enough gasoline can cause a backfire, too.
The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed.
If you spit the instant you blip the throttle, then it`s probably the accelerator pump in the carb not working, or not squirting enough fuel, so the engine takes a gulp of air and goes lean, which causes the spit back-up through the carb.
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.
Clogged or Dirty Air Filters

Dirty air filters are one of the most common reasons lawn mowers sputter. Dirt can be present in the apertures that lead from the carburetor and the fuel filter and interrupt the flow of fuel supply to the combustion chamber. You want to be sure to clean or replace dirty air filters.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

What oil do you use in the YT4000 lawn tractor with 24 hp v-twin

My engine turns but does not start i am getting spark at the plugs i dont think there is enough fuel being pumped in
ANSWER : Try getting a can off carb cleaner or brake cleaner and give it a good spray in the throttle/carb this will likely do the trick.

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.

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″.

Can you put synthetic oil in a briggs and stratton motors
ANSWER : Every time i tried they started to leak

My craftsman riding tractor keeps blowing the fuse under the hood. sometimes it cuts for five minutes, sometimes it cuts for hours. i have no clue and suggestions would be appreciated.
ANSWER : I would try tracing the entire wiring to see if any are exposed and are touching metal.

Engine will not turn over ehen hot – Craftsman 42" Briggs & Stratton 17.5 hp Gas Powered Riding Lawn
ANSWER : Your problem could be the starter or battery. Because the engine will not turn over when hot, I suspect the starter.

<!– from fixya rte –>How do i replace reed valves – Craftsman YT 3000 42" Kohler 22 hp Gas Powered Riding Lawn Tractor
ANSWER : I think some of the pictures here can show the reed valve location and removal at this link
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