Briggs & Stratton 14.5 hp riding lawn mower

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Old 04-09-10, 03:03 PM
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Briggs & Stratton 14.5 hp riding lawn mower

Hello,

I inherited this mower from my parents who hav'nt used it for about a year. The mower itself is only 4 years old. I had noticed after running it for a few minutes that it started blowing out white smoke through the exhaust. Then the mower died. Long Story short, gasoline is leaking into the engine. I watched last night as it ran for a minute, then a mixture of gas/oil came flooding up through the breather tube into the air filter box. This then caused massive smoking and the engine to die. What would be wore out to cause the leak? Would it be the head gasket? Any suggestions?
 
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Old 04-09-10, 04:46 PM
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Carb is flooding and draining into the oil. Carb is varnished up and needs a cleaning. Can you post the numbers of the engine and the mower?
 
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Old 04-09-10, 08:59 PM
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Engine Numbers

It is a model 287707, Type 1224-E1.

I dismantled the engine down to where I could see the piston, and everything looks healthy. So possibly you are right and the carb is just running real rich. How does one adjust the carb?
 
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Old 04-09-10, 11:16 PM
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Sorry Daddy, you have the wrong idea.


More than likely the needle that is operated by the carburetor float is failing to shut off the fuel when it should. Usually the needle and linkage need to be cleaned of accumulated varnish.

You should probably get a carburetor rebuild kit and do a thorough job of cleaning the carb and replacing the parts that come with the kit.

You should then be rewarded by AMAZING improvements in how the engine starts and runs!
 
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Old 04-10-10, 03:59 AM
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it's true, fix the carb and do not run motor anymore until you change the oil. Might be a good idea to also install a fuel shut off valve. Even the cleanest system can get a piece of something in the carb to cause the needle valve not too seat.
I have filled the tank one day to find it empty the next where the fuel kept draining, luckily it drained through the exhaust but could have gone in the crankcase, it can go either way, never good for the motor though to be washed with fuel.
 
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Old 04-10-10, 05:48 AM
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Thanks

Thanks. I'll reassemble the engine and take the advice given to me. I'll buy a carb rebuild kit and do my best to fix it right. I never thought about there being that much gas flowing from carb. Especially as much as was flowing through it.
Thanks for everyones advice.
 
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Old 04-10-10, 06:12 AM
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Before you go to the mower shop, look at your carb. You will need to know if you have a Walbro or a Nikki carb. The name should be stamped or embossed on the side of the carb.
 
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Old 04-10-10, 07:57 AM
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Another way to identify the carburetor would be to look up the part number of the carb based on the make and model of the engine.

Often you can find detailed exploded parts diagrams on engines on the internet with the part number of carb kits and such.
 
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Old 04-10-10, 01:28 PM
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Originally Posted by SeattlePioneer View Post
Another way to identify the carburetor would be to look up the part number of the carb based on the make and model of the engine.

Often you can find detailed exploded parts diagrams on engines on the internet with the part number of carb kits and such.
His engine could have either or for carb. I looked it up and it lists both Nikki and Walbro which is why I told him to look at his carb.
 
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Old 04-12-10, 07:28 PM
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Checking in

Thanks all, I'm still in the process of getting it repaired. I'll post on here when its done and let ya'll know what fixed it.
 
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