B&S Carb Cleaning


Old 06-04-10, 10:36 AM
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Join Date: Oct 2001
Location: USA
Posts: 83
Question B&S Carb Cleaning

I have a Briggs & Stratton motor 98902-0110-01 on a push mower. It starts easily, but then stops after a few seconds - like it is not getting fuel. I am looking for for plugged openings in the carburetor, but this carb is pretty simple. Is there a common trouble spot?

At this site Manuals, Parts List & Wiring Diagrams - Briggs & Stratton there is a link to a parts diagram. Is the check valve under the screen? If so, how do I remove it? Is this a likely trouble spot?

Any other ideas?

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Old 06-04-10, 11:49 AM
hopkinsr2's Avatar
Join Date: Feb 2005
Location: canada
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You should hear it rattle when you shake the carb.. I don't think it's serviceable but you can loosten them up with carb cleaner most times... I'd be thinking more like a diaghragm... Roger
Old 06-04-10, 02:57 PM
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Join Date: Oct 2001
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I don't hear it rattle nearly as I would expect. Should it be clearly heard? The diaphragm is not torn, but could be stretched. Does that happen?
Old 06-04-10, 04:59 PM
Join Date: Jun 2006
Location: St. Louis
Posts: 2,365
You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.
Here we go;

Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Check the intake tube to see if the O ring seal and plastic retainer are still on the intake tube, if so remove them and re-install them into the carb. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble), now with a small screwdriver pry out the main jet(carefully) and clean it, check the O ring on the main jet for damage, if it is damaged it must be replaced, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem(not necessary if the fuel tank was clean). Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo
Old 06-05-10, 09:51 PM
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Join Date: Oct 2001
Location: USA
Posts: 83
Thanks everyone, It seems to be running properly.

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