Need some thoughts on a Briggs engine

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Old 09-06-10, 12:13 PM
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Need some thoughts on a Briggs engine

I've got a small "Weed eater" push mower in with a Briggs & Stratton engine. The numbers on the engine are M-09S502, T-1019 B1, C-09100552. The engine will start easily but stops in a few seconds...if I keep pushing the prime bulb, it will keep running. So I removed the carburetor which is a pulsa-jet with only one pickup tube. Everything looks fine. This mower belongs to my granddaughter and is new, in that it's been run only two or three times. She lost the bill of sale and cannot return it. Could you give me some ideas of what to look for?
 
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Old 09-06-10, 12:43 PM
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Jack,

Couple things come to mind, The main jet is plugged/restricted under the screen or the diaphragm is not positioned over the ports correctly. The diaphragm may be faulty as well from the alcohol in todays fuel.
 
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Old 09-06-10, 05:34 PM
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After disassembling the carburetor, I took a small wire (0.015") and ran it through all the small passages in the carburetor. After reassembling it...it worked OK.
 
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Old 09-06-10, 06:22 PM
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Good deal Jack.........
 
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Old 09-06-10, 07:38 PM
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Originally Posted by Jack B. View Post
After disassembling the carburetor, I took a small wire (0.015") and ran it through all the small passages in the carburetor. After reassembling it...it worked OK.
When it fails the next time:
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
 
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Old 09-10-10, 05:30 AM
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Thanks for the detailed infomation, Geo.
 
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