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Repair information for the Pony 42, a Troy-Bilt brand riding lawnmower.

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Riding Lawn Mower, Engine dies, gas in oil.

Hello, I recently purchased a 2004ish Troy Bilt Pony. The carburetor was leaking gas from the breather tube, and the oil had gas in it. So I replaced the carb and oil. Now the gas stays in the tank. However, when I start the engine, it seams to sometimes struggle, but eventually starts and runs for about a minute. Then it slowly putters out, almost like it's out of gas. If I wait about 30 seconds, it will start up and do the same thing again. I checked the fuel lines and gas cap and they seem to be fine. I also rechecked the oil and there is definitely still gas in the oil. I am not sure if it was residual from the old problem, and I am not sure if that is related to it shutting down. - Extra info, when the engine is started in choke, it puffs black smoke with each stroke. -

I am very new to working on engines and would appreciate any and all suggestions. Thank you for your help!

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Forgot to mention it has a Briggs & Stratton 17.5hp engine, with (I think) no Fuel pump as it just has a tank, gas line, straight into the carb.

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As far as your fuel straight to the curb from the tank, that sounds like a gravity fed system, so no gas pump is needed.

I am not sure how helpful this will be as I'm new to Small engines as well but with a car when you have that happen it's your head gasket or lower gasket that needs replacing. So when you emptied out gas and oil did you take it apart and replace the gasket to keep the two fuels separated, if not you will need to do that.

Do some research and look for a gasket before you attempt to do it.

Once you have the gasket make sure you clean both sides when you separate it very thoroughly before putting the gasket in and back together.

As for the black smoke that sounds like the oil gas mixture blowing off in the carburetor which should be cleaned when you take care of the gasket and then it might go a couple times after but should disappear and not be blowing black smoke any longer.

I hope that this is helpful, good luck

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Jeremy Clark sera éternellement reconnaissant.
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