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Mower idle fast - Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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1 Answer

Lawn man idles too fast

Could be a broken or worn throttle shaft,letting air in to the carb when it shouldn't !

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loosen the bracket on the engine holding the throttle cable start it and move the cable until it idles right but first check the idle screw on the carb turn to the leftwhile running

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1 Answer

I start the engine and it sputters at fast idle and then eventually shuts off.

I think that after you start the engine you need to move the throttle lever off what you are calling fast idle (which is full choke). Simply slide the throttle lever down until it smooths out and runs properly.

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1 Answer

Idles fast all the time once you start it up...........just started doing this and is only one year old.......

Other than the throttle sticking there may be a couple things:
The idle screw is mal-adjusted.
There is an air leak where the carburetor meets the block.
The governor spring has bound or streched (depending on type) affecting the RPM.

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YardMan U804H lawn tractor idles too fast

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It is idling too fast and has a terrible vibration

The idle can be adjusted by moving, either left or right, a small lever in the front of the engine. The vibration is most probably caused by a lose or damaged blade or and excessive build-up of clipping under the deck.

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3 Answers


Your engine per John Deere is a Kawasaki FH500V

Here is the service manual (3.58 Mb pdf file) This should get you going again.

Jan 23, 2010 | Garden

1 Answer

Lawnmower cuts out on fast idle + runs rough

REBUIld carb it is dirty jet is clogged

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