Model 445677 engine runs fine for about 30 minutes then stalls. I replaced the fuel filter and carburetor, but the problem still exists. What do you think the problem is?
SOURCE: Craftsman 7.0 HP Briggs & Stratton mower stalling
Check the muffler, if the muffler is clogged it could cause overheating of the engine, and could keep the engine from getting the necessary fuel-gas mixture.
SOURCE: I have a John Deere riding mower with a B & S
Possibly a restricted carb, or float level (if it as one).
SOURCE: need help with cub cadet lt 1045 engine running
Anthony, this could be from the governer linkage which is intended for maintaining a specified top rotation per minute speed ( R.P.M ) is a possability im not sure of your specific adjustment procedure allthough most are a simple lossening of the linkage mounting to the shaft bolt while this bolt is loose you push the linkage to full throttle travel activation allowing the control linkage that was lossened to turn in its mount ( pivot) and keeping the threw the block mounting at full activation range ( travel ) in its farthest position re tighten the arms securing bolt,to secure it at its proper activation range ( at the pivoting point) I hope this helps if your unfamiliar with this type of governer control linkage, i would seek to locate a diagram on line that you can view to assist in your specific engine's linkage adjustment , and another possability is your carbuerator's High speed needle valve is to lean or to rich hope you analysis the problem Steve
SOURCE: I have a Bolens Model
Hi JustSomeDude...
Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
NOTE: Before you dissemble the carburetor:
Make sure you mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you dissemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
Also make sure you are using fresh fuel
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank and run for short periods of time.
I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor rebuilt that should solve your problem.
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SOURCE: Engine runs great for 10 minutes and then stalls.
Believe
it or not, your gas cap is clogged up with dirt and debris. When a
carburetor is unable to get a constant flow of air from outside,
pressure builds up on the fuel tank. The fastest way to determine
whether or not this is the problem is as follows.
As you are
using your Mower, at that point when it begins to stall out, loosen
the gas cap so that you release the pressure that is built up in the gas
tank. If the engine begins to regain power, then you know it is a
clogged gas cap. (Simply get a small wire and clear the breathe holes in
the cap.) If the engine dies even after loosening the gas cap, then you
may want to check to make sure the air breather is clean. ( A dirty air
breather can cause the engine to over heat and stall out.)
If none of this seems to help, then it is probably a bad Ignition Coil.
Good Luck!
Jim
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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