The bowl under primer button,took apart to clean not working well,already changed plug and air filter was told to check pin hole in brass bolt, was dirty but now cant get it to go back in,does plastic go into brass then into hole,or upside down with plastic on top of brass bolt.
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Remove and clean the brass bolt that holds the float bowl on the carburetor. Clean out the bowl too. Use no metal objects to clean this bolt. It has 3 small holes...bottom...and on the sides near the top. Use carb/choke aerosol spray cleaner on it. IT can clog (esp. without an inline fuel filter on mower). Clean the bolt good, reinstall (not forgettting felt gasket between IT and the bowl) and your runnability problem and fuel flow problem should be solved as the bolt is also the main jet of the carburetor.
Drain the fuel or when you remove the float bowl bolt (also the main jet), then hold up on the float to keep the needle on the seat so gas won't go everywhere. When you have that brass bowl bolt off, clean it! Use nothing metal on it. Pay close attention to the small hole in the bottom and along the smooth unthreaded part at the other end. Use carb/choke cleaner to blast gum and dirt out of those very small fuel orifices. I recommend installing an inline fuel filter also. A shut off valve is recommended too, that way if the needle in the carb sticks open, the crankcase won't be polluted with gas. Usual symptoms on a clogged lawn mower main jet though, are after pushing primer bulb, engine runs about 3 seconds. Try the brass bolt cleaning and post back if needed.
There could well be a build up of sediment and debris in the main jet to the carburetor. It is easy to get to and clean. It is the brass bolt that holds the lower float bowl onto the main body of the carburetor. To clean it, drain your gas. Remove the bolt and external washer UNDER the carburetor bowl. Clean out the bowl of any sediment and/or water. To clean the brass bolt, use no metal objects. Carb/Choke aerosol spray cleaner will do the job. Pay close attention to the hole in the bottom of the bolt and the very small holes about 2/3 of the way up the bolt. Clean till shiny with holes cleared and reinstall. Your fuel flow problem and shut off condition may be solved.
Your mower has to have these things all working in unison to start 1. Compression (the engine has to be in good shape) 2. Clean Air (Check Air Filter) 3. Clean,fresh constant fuel supply (Maybe remove bowl of carburetor and clean/check for debris and/or water). 4.Strong Spark (Remove Plug and ground the body against the engine. Pull starter and check for nice, blue spark.
Sometimes, the problem is as simple as the brass bolt that holds the bowl on the bottom of the carburetor is clogged and needs cleaning. That's because this dual purpose bolt is ALSO the main jet. So if you remove it to clean the float bowl, clean the bolt as well. Use no metal objects on it at all. There are small holes in bottom and along the sides that get gummed up when fuel dries.
Carb/Choke areosol spray cleaner will clean the bolt. Remember, don't scrape it up.
Check all these things. To maybe "coax" the engine to run, remove the spark plug and spray a couple of shots of carb cleaner into the engine. Immediately choke it and pull start.
Some OHV lawn mowers are difficult to start because the overhead valves need adjusting periodically. The Briggs and Stratton website have instructions and specifications for doing this. It is not real complicated and allows for easier starting and much better running. Post back if needed.
Try removing the brass bolt that holds the float bowl to the carb on and cleaning it thoroughly. This bolt is the main jet for the carb and can become clogged with varnish or debris esp. if no inline filter is used or gas is allowed to evaporate in the carb. There will be small holes on the bottom and the sides where there are no threads. If no other problems, this should cure the 5 second run.
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You may need to also thoroughly clean the small holes in the brass bolt that holds the carb bowl on...holes at botttom and across the middle where there are no threads. Don't use anything that will enlarge these holes as this bolt is also the main jet of the carburetor.
There is one thing fairly easy you can try. You take the aluminum bowl (bottom) off the carburetor. There will be a brass bolt with a washer holding it on. When you do this the carb will leak gas so you should drain the fuel first or stick something under the carb to collect it. There will also be a gasket between the bowl and carb body. Don't mess it up. The bowl should be cleaned and have no residue or dirt or water in it..the brass bolt is the big concern here though. Inspect it closely ...tiny holes in the smooth part above the threads...and bottom...make sure they are clear. Use carb cleaner Dont enlarge any of the holes...clean with toothpicks, no metal....this is the main jet to the carb. Try it.
I got a new air filter for mine today, plus cleaned out the metal fuel canister under the carburator and the little brass bolt and my mower started right up. I was having hte same problems getting my mower to run and stay running. Glad I checked this site!
Probably a carburetor problem. Old fuel, tiny amounts of water, plugged jets or a totally plugged air filter will cause that. Another option may be the throttle linkage is either unhooked or bent. Remember to shut off the gas tank or empty it or plug the line before opening a carb or removing the carb. Carb first, on the bottom is a float bowl held in place with a bolt that is hollow and is also a fuel jet. Remove the sediment(float) bowl and make sure it is clean, make sure the gasket on top is not damaged.Make sure the float moves freely up and down and the needle valve is not stuck. Make sure nothing is bent or shows rub marks on the float. Clean the needle valve and all orfices in the carb by spraying carb cleaner through them.The "bolt" that holds the float bowl is usually brass and hollow in the center with two tiny holes that are horizontal, if the center or the holes on the side get plugged - the engine will not run, it will only run until it uses up the gas that seeps into the center. Remove any gaskets first as carb cleaner will cause rubber to expand and get very soft. It is best to usually remove the carb to do a thorough cleaning.When every thing is clean reassemble and reinstall the carb. Clean the air filter thoroughly with some solvent or gasoline, and let it dry (foam filters) for paper filters, blow them clean from the inside using compressed air. When all is back together, check to see the wire linkages are in their proper place and that they move freely. Also ensure the choke is not on and that it works properly when it is started. Occasionally also this problem may be caused by a defective primer bulb if it has one. Usually if defective it will either leak or not work. Some are made with a tiny hole in the end, covering it will cause the engine to speed up.