Briggs and stratton 3 HP. motor appx 15-20 yrs. old. Runs well after servicing but plug still carbonising Service man seems to think that this is an ignition problem and may require new motor as parts are not avaliable appx. $ 400. Please advise.
If it was an ignition problem then it should run poorly. The fouling of a plug is caused by a rich running unit which leads me to a carburetor issue feeding the cylinder more fuel then it can completely burn off. Without having the unit in front of me however, it is hard to say for sure.
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SOURCE: will not start, briggs & stratton 3.75
put a small amount of gas in carb from top and try it. if still not starting make shure choke is in closed position . check the safty switch handle . you do have spark/ and gas
SOURCE: Briggs & Stratton engine on Murray lawn mower
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
SOURCE: Briggs & Stratton 4.5 hp running rough...too much fuel
Hi did you squeze excess oil from filter so it can **** air in??
SOURCE: Briggs & Stratton Modle# 100000 will not stay started.
your engine is only running on the fuel you are pumping in, the carb. is not lifting the fuel on its own, maybe because of water in the bowl or dirty jets. You must take the bowl of and clean it out and depending on the type of carb. it might need a new diaphragm. Stephen.
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SOURCE: craftsman briggs and stratton 6.50 190cc lawn
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, 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.
If the mower is over a couple years old, then I also 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.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
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Good Luck, I hope this helped
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