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Post Info TOPIC: 4 hp Briggs and Stratton lawnmower carb question...........


Ford Tech

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4 hp Briggs and Stratton lawnmower carb question...........


I have a Murray lawnmower with a 4hp Briggs engine. If I had to guess ( because I can't remember LOL) it's around a 2002 model. Anyway it has one of those crappy plastic carbs. It's been having a surge problem for a while but still ran ok to get the small yard cut we have here. I've had it apart a few times to inspect and clean and the other day it just farted out. Looking at it today it first appeared the carb base was cracked. But upon closer inspection when I took it apart I think I found the problem. Above the pickup tube that goes into the tank there's a BB size ball bearing pressed in the end that seals the gas passage from the gas pickup tube to the primer bulb. Gas was leaking out around the ball bearing. To confirm this was the issue I put my finger over the BB and primed the carb just fine. Without my finger there it just sucked air and would not prime. Put it back together and put a small dab of vaseline over the ball bearing. Primed, started ran fine and was able to finish cutting the grass. biggrin My question is what would be a good fix for this? I was thinking a dab of some RTV, epoxy or JB weld possibly? But it would need to be gas resistant and not allow air to get sucked around the bearing. I suppose the best fix would be to dig out the little BB and install a small allen screw with some sealer on it?? If I bugger it up though I'm looking at a new carb which seems to be almost $60. The lawnmower was only $100 on sale years ago. So looking for simple ideas what the best fix would be. confuse Thanks. G.



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The best fix would be be a New Carb . I know a Few Places that we can check the prices at . To try and fix that carb ? You could try a Rounded Punch that may stake the aluminum Down and seat the check ball it still need to be able to roll in it's seat but not be as Loose as it is . I had a mower Like that . The Primer bulb was not working . I would hit it with a shot of starting Fluid each time I had to Cold Start it . It was worn out so I replaced it because I have Lots of Grass

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Ford Tech

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Oh I didn't know it was a check ball thanks Tango. Yes please if you know of some sites that sell them please let me know.

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Get the Engine #s Should be on the Pull Start cover . I will Look it up . I would say right of the top Pat's small Engine Parts will have the best price .

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Ford Tech

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Ok has "model- type-code" over these numbers......... 10A902 2291 B1 02050955

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Ford Tech

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Just took a look at Pats site and looks like carb # 497619 as my serial # falls in the description? $23 and change for a new replacement carb if that's the right one. Pretty good deal. Thats a great site BTW thanks.

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I found this info also. If it's a plastic carb...

My engine will not start . The primer bulb does not seem to prime engine unless there is a full tank of gas & then you have to push the bulb at least 10 to 20 times. What can be wrong?

There could be a few things going on. There is a diaphragm and gasket between the carburetor and the fuel tank. Usually that diaphragm is the problem. When you push the primer the flappers on the diaphragm close and force the fuel into the carburetor. If they are not closing because they are dry, it will not prime. I recommend replacing the diaphragm first. To do that you will need to remove the fuel tank and the carburetor. Then remove the screws securing the carburetor to the tank. Once removed scrape the surfaces clean and inspect the tube that goes into the tank. If you see any cracks or holes in the tube, the carburetor has to be replaced.


kit part number 795083
you can order it from: http://www.searspartsdirect.com/partsdirect/index.action?MML=MMLxexpertxmerch


Check this out also:
http://stores.innovativemechanisms.com/-strse-4-dsh-stroke-Carburetion-cln-briggs-&-stratton/searchpath/55684840/start/91/total/107/Categories.bok



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Good News is that Carb is cheap . Bad News is have to find the code date Might have to call them on this one . http://www.psep.biz/


497619 Carburetor | Used Before Code Date 96052000 $23.99
795477 Carburetor | Used After Code Date 96051900 $23.99
795477 Carburetor | Used After Code Date 96051900 $23.99
497619 Carburetor | Used Before Code Date 96052000 $23.99

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Here is one From that Link Denny .W posted -> http://stores.innovativemechanisms.com/-strse-203/Replaces-cln-%C2%A0Briggs-%26-Stratton-No./Detail.bok



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Ford Tech

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Thanks guys this is all really good info! I'll give them a call and see which carb I'll need. At least it's not that expensive and parts easy to get. And I've had this thing apart so many times now I can do it in my sleep. LOL. Everything gasket and diaphram wise looked good but I'll take a closer look tomorrow. And take it apart again for a closer inspection. Many thanks.

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