I always replace the air filter if its a paper element, and even if its a foam element I replace it rather than clean it. That said, engine stumbling is rarely and air flow problem - but it could be, so having a new filter assures no air restrictions.
I would drop the carbuerator bowl. On the bottom of the carb, near where the fuel line comes into the engine, should be a nut. Removing this nut allows the bowl to drop off the carb. Some engines the bowl screws off, you will have to look at the bowl. Often the bowl has sediment or sludge buildup inside. Cleaning the bottom of the bowl can prevent that sludge/sediment from plugging the intake tube. Even on newer mower models this is a common problem, the gas line tubing interior breaks down and the inside of the tubing can start degrading - ending up in the bowl as sludge.
After cleaning the bowl, I would add one ounce of fuel line cleaner to a full tank of fuel and run the entire tank of fuel. This will clean any deposits or "varnish" from the interior carb parts. Doing this and the first step will assure your carb is clean and functioning.
If that doesn't help, then I would look at the spacing between the magneto and coil assembly. If you want to do that I'd like you to write down all the model numbers and serial numbers on the engine nameplate, that way I can give you specific directions.
Hope this helps,
Gregg
I received your model information - have been out of town on business, I will research this model tomorrow and get back to you Saturday with the information, thank you for your patience, we'll get this ironed out! Gregg
Hi, spent some time in troubleshooting manuals for the B&S engine. "First things first" as my grandfather used to say; you noted it is still puffing oil (smoking a little). Usually this is because there is too much oil in the engine. Sometimes not. I'd like you to do this to verify it wasn't accidentally over-filled:Don't start the mower.
Move it to a level surface (garage floor is fine, or cement sidewalk).
Let it sit for 30 minutes.
Remove the dipstick and wipe it clean of oil.
Note if there is a line or mark on the stick, or if it has a hole drilled in it.
Put the dipstick back in, and screw it all the way down (if it screws in - otherwise push all the way in).
Remove it and note where the oil level is.
It should be below the "fill" line if marked, or below the hole drilled in the dipstick.
If it is above the level (hole or line) then remove enough oil to make sure it is under the fill line.
Start the mower and let it warm up.
Is it still smoking?
If so, we may be looking for a different root cause for the missing or rough operation. Let me know.
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Did all you suggested. It helped a lot but still the mower smokes a little, and still runs a bit rough.
The engine is a Briggs & Stratton, 4.5 hp,
Model #10G902-0171-B1,
Code #03031855
Maybe you can explain "the spacing between the magneto and coil assembly"? Thank you!
briggs and stratton 465cc riding lawn mower
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