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| I have a Murray push lawnmower with a Briggs & Stratton 300 series engine. The numbers off of the mower are:
Model - 9T602 Type - 5019 B1 Code - 11082952. The mower is only about a month and a half old. It has always started fine but since last week, it doesn't sound like it is running full throttle. It is also puffing a small amount of black smoke. I thought the problem might be a dirty air filter so I inspected it. It looked clean, but I decided to be sure so I soaked it in warm soapy water, rinsed it off, and put a little bit of oil on it once it was completely dried. When I placed it back on the mower, It ran great for a few seconds then the RPMs went down again. If I run the mower without the air filter installed it does run a lot closer to what the "normal" sound was, but as soon as I put the air filter back on it bogs down again. Today, after some internet searching, I decided it may be a dirty carburetor. I inspected it and found it to be clean, with no blockages in sight. All of the signs seem to point to one of these two pieces, and since there is black smoke involved I read that is a sign of the carburetor burning too rich. Any ideas or help would be greatly appreciated as I have only used this mower 4 times. |
Follow-Up Postings:
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- Posted by bill_kapaun Z8 Orygun (My Page) on Sat, Jun 9, 12 at 17:35
| Your model isn't recognized at the Briggs site. Sure it's not a 9T702??? IF it was only as old as you state, I'd let the dealer fix it under warranty. |
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| Maybe the governor spring is off or the tab got bent trimming up against shrubbery etc. Distorted diaphragms will cause a rich condition. |
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| Just double checked and had another set of eyeballs look too. It is in fact a 9T602. Unfortunately it's on a cheap-o mower purchased from a local Wal-Mart. I had one from there previously that ran great the entire time I had it so I wasn't worried about quality. A friend of mine who has a lawncare business said that I should look into replacing the carburetor so I guess that's the route I'll be going. |
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| Does it have mixture screws?? sometimes the vibration will cause the mixture screws to move alittle. IF you find mixture screw try turning it in 1/8 of turn or so. Just note the index of the screw head so you can turn it back if that don't help. |
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| No mixture screws on late-model mowers. I'm guessing this one is a 'Pulsa-Jet' with the gas tank under the carb, and with the spring-loaded choke plate. I think the choke plate is sticking, enriching the mixture. If its like I say, take the air filter off and start it. After a minute or so, take a screwdriver and flip the choke plate wide open to see if it speeds up and runs right. The plate should move freely and has a little spring that holds it more closed. It works by staying almost closed at starting RPM so it enriches the mixture for starting. Once the engine is running at speed, the stronger air flow is supposed to hold it mostly open. If this is the problem the choke area may need cleaning or other repair if the choke doesn't open after starting. |
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