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My lawnmower is DRIVING ME NUTS! Briggs and Stratton- Take a look.....


cturboaddict's Avatar
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11-14-10, 09:33 AM   #1  
My lawnmower is DRIVING ME NUTS! Briggs and Stratton- Take a look.....

Ok, its a Weedeater 22" lawnmower with a Briggs and Stratton 500 series 5hp 158cc. Pull start, plain push mower... Anyhow, it slowly developed this problem that continues to get worse everytime i use it. When i fire it up, it sorta wants to rollercoaster its idle, UP/DOWN/UP/DOWN and will continue to do this the whole time its running. It will sort of bog when mowing along and sometimes almost die. Ive taken the air filter off (foam) and tried to clean it and put it back on, but still the same problem. The air filter was VERY oily too!
Also, when i look down at the linkage on the carb, it seems there are two return springs, that really dont do anything as loose as they are. And another spring connected to a blade under the cover that im assuming is supposed to keep the throttle open by cathing the wind from the "fan blades" under the cover? But that dosent seem to even effect the linkage at all?

The mower is fairly new, and ive replaced the plug on it, and made sure it had fresh gas in it? ANY SUGGESTIONS?

 
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11-14-10, 10:36 AM   #2  
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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11-14-10, 11:23 AM   #3  
Thanks, ill be sure to go see if lowes or home depot have that kit... Or ill order one!!
So does the diaphram just wear out over time?

 
cheese's Avatar
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11-14-10, 11:38 AM   #4  
It stretches. HD and Lowes don't sell it, your local small engine shop should have one on the shelf though.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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11-14-10, 12:21 PM   #5  
Posted By: cheese It stretches. HD and Lowes don't sell it, your local small engine shop should have one on the shelf though.
The Lowe's here in St. Louis sells the 5083 kit, I can't speak for other Lowe's or HD, it is about $4. Have a good one. Geo

 
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11-14-10, 03:46 PM   #6  
Oops, I didn't know they sold them. I don't think our lowes does, but it's been a little while since I checked their mower section. I know they carry very little here, and nearly no parts to speak of other than service items. Good to know!


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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