Question about Briggs & Stratton Garden

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Mower is running rich and rough

148cc engine Model 09T602 5019 B1. Replaced diaphragm under carburetor because engine had no power and barely would run. Now it runs at higher rpm but runs rich and runs rough..getting too much fuel now it seems.

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  • Travis Hogue Apr 24, 2013

    Additionally, I replaced spark plug with the proper gap, drained tank and added fresh fuel, removed and thoroughly cleaned the carburetor. Don't quite know what else to do at this point except maybe replace the carb.



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Hi Travis

Posted on Apr 25, 2013

Testimonial: "Hi Travis is not a solution to my problem...don't know if the post didn't show up or what...still need a possible solution to my problem."


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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: I have a murray 22 inch lawn mower with a 4.0 hp briggs and

Change your air filter, spark plug, fuel filter, and oil. Then make sure the gas is fresh. Gas starts going bad after a month. Spray carb cleaner in hole underneith the fuel filter. Oh yea dont put more than 20oz of oil in it.

Posted on Mar 27, 2009

  • 86 Answers

SOURCE: Briggs & Stratton engine on Murray lawn mower

I always replace the air filter if its a paper element, and even if its a foam element I replace it rather than clean it. That said, engine stumbling is rarely and air flow problem - but it could be, so having a new filter assures no air restrictions.

I would drop the carbuerator bowl. On the bottom of the carb, near where the fuel line comes into the engine, should be a nut. Removing this nut allows the bowl to drop off the carb. Some engines the bowl screws off, you will have to look at the bowl. Often the bowl has sediment or sludge buildup inside. Cleaning the bottom of the bowl can prevent that sludge/sediment from plugging the intake tube. Even on newer mower models this is a common problem, the gas line tubing interior breaks down and the inside of the tubing can start degrading - ending up in the bowl as sludge.

After cleaning the bowl, I would add one ounce of fuel line cleaner to a full tank of fuel and run the entire tank of fuel. This will clean any deposits or "varnish" from the interior carb parts. Doing this and the first step will assure your carb is clean and functioning.

If that doesn't help, then I would look at the spacing between the magneto and coil assembly. If you want to do that I'd like you to write down all the model numbers and serial numbers on the engine nameplate, that way I can give you specific directions.

Hope this helps,

Posted on Mar 29, 2009

  • 32 Answers

SOURCE: Mower idles rough and stalls at times. Also blows

look by the carboreter and there is a little screw with a spring. turn the screw a half turn and try to start it, then try another half turn, and keep expirementing.

Posted on Jun 13, 2009

  • 41 Answers

SOURCE: Briggs & Stratton 4.5 hp running rough...too much fuel

Hi did you squeze excess oil from filter so it can **** air in??

Posted on Aug 04, 2009

  • 486 Answers

SOURCE: I have a Sears Craftsman mower with Tecumseh, major oil leak

On many Tecumseh engines, there is a crankcase breather located under the flywheel. It has a cork gasket to seal the top plate of the breather. Either the rubber breather housing is cracked, or the cork gasket needs replaced.

Posted on Nov 08, 2009

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1 Answer

Murray lawn mower model number m20300 trying to locate carberator

Murray M20300 is produce by Husqvarna (HOP) group. Its product number should be 96114002702. It uses a Briggs and Stratton engine model number 9T602-5019-B1.

The carburetor PN is 795475 which include the 795083 diaphragm and gasket. This diaphragm and gasket is most problem found when the carburetor fails to operate. Considering the cost of the carburetor kit it is just cost effective to purchase the whole carburetor replacement kit.

You can purchase from online vendors that sells Briggs and Stratton parts or purchase local from a local shop that deals with Briggs and Stratton engines.

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if its a briggs and stratton engine with the plastic carb fixed to top of the fuel tank then you will need to replace the diaphragm and blow out the fuel pick up pipe

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Working on a Briggs and Stratton 10T502-1457-B1. Runs rough and has black smoke coming from exhaust. This engine has no float to stick so that is not the problem. It does have a fuel primer bulb that works...

if you replaced the diaphragm and gasket below the carb and are completely positive they are installed correctly and not damaged, then the carb is defective and they usually warp or the primer system goes bad

Oct 21, 2013 | Briggs & Stratton Garden

1 Answer

Engine misfires and emits black smoke

You may still have to do a more thorough cleaning of the carb and all passages. I have not had these problems with mine yet to inform of proper technique and chemicals to use. To err on the side of caution. Remove the carb and clean in a ultrasonic cleaner with a water and simple green mix.

Apr 27, 2013 | Briggs & Stratton Garden

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Craftsman mower runs rough sometimes when engine has load on it.

adjust the mixture screw on the carburetor while under a load.

Apr 20, 2013 | Garden

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A 450 series 148cc on a victor, mower starts but runs rough(low engine rev and blows black smoke)

There has been a great deal of issues with the diapham between the carb and the tank, replace it and hopfully all will be well again.

Mar 10, 2013 | Briggs & Stratton Garden

1 Answer

The lawn mower will start but after about ten seconds it quits. Then it is hard to start up again.

I looked up your engine in the mower parts manual below: (232kb)
The engine number is: 10T802-1098-B1 vs EA

The ENGINE operators manual is here: (7.66mb & not much help)

The engine parts list is here:
Open the diagram carburetor controls fuel supply and governor spring or use this parts manual link to download the engine parts pdf file: (Best!)

Either the primer bulb item 976 has a pin hole in it or... the diaphragm item 394 has a pin hole in it.
Given the cost of both parts I would replace them both and send you on your merry way if you brought it to me for repair.

There are 2 part numbers for the diaphragm. 795083 (Most models) and 796478 used on type 156 models. The type number is usually on the air shroud near the spark plug.

The primber bulb 694394 is common to both engine types.

As I mentioned earlier one of these items has failed. I recommend you replace them both and your mower will run fine. ( The gas tank and carb have to be removed as an assembly before you can change the carb diaphragm once the tank is removed.

Thanks for choosing FixYa,

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it sounds like the diaphragm needs to be replaced.

don't forget to vote for me.


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1 Answer

Mower runs very rough

Sounds like a bad diaphragm in the carburetor.


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Fuel pumps just supply fuel to the carb. Either they work or don't work. I would make sure that the mixture screws on the carb are set properly. Turn the screws in to lean out the mixture, do one at a time.
You want to turn the screws in to the point where the jeep will start to idle rough and then back out a 1/2 turn. Check your timing also. If the jeep has alot of miles on it, the timing chain will stretch and it's possible that you cannot get the correct timing.

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