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Engine revs up and down on MTD 13.5 HP Yard Man lawn

I just bought a used MTD 13.5 HP Yard Man lawn tractor that seems to have an engine problem. After choking, starting and running for a few minutes (perfectly), the engine then begins to rev up and down by itself. It does this at nearly any throttle setting, but it dies at the lower settings. It won't mow grass because it dies.

It may not be relevant, but it sounds excessively loud at the exhaust. Also potentially irrelevant might be that the tractor came from California originally.

I checked gas, lines, air filter, carburetor for obstructions. The guy who sold it says it needs a new carburetor. He says the two wires running to the bottom of the carburetor open the gas flow. He thinks that electrical part is bad and the gas isn't flowing consistently.

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Hello ctacket You may have 1 of 2 problems. First the carb. may just be dirty. It should have a 1/2 inch bolt directly in the bottom of the Carb. bowl. turn off the fuel pecock. Remove this bolt and carefuly remove the bowl. It has a rubber gasket at the top becareful not to damage that. ck for dirt or gummy old fuel and clean with spray can brake cleaner. 2nd problem may be a bit harder to find and fix. it sounds a little like a speed governor spring may be missing, out of adjustment or has gotten very weak with age. This is located on top of the carb. and hooks to another rod on the engine. as engine load increses the engine slows down (cutting into thick grass, no matter what speed you have set the engine at will slow down the engine down, then this gov. moves the speed rod on the carb to increse engine speed to over come the load) I hope I this makes sense. Ck for dirty carb bowl first, then dig into the gov and spring. I will try and help you out if you need more.

Posted on Jul 01, 2009


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