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I have a JD 425 Y-Twin liquid cooled 20 hp ohv k series Will start but will only stay running at half throttle with choke pulled all the way out will kill if I pull choke in evertime.

This started all while I was just riding around under no stress of mower or anything else.

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There should be a sensor on the bottom of the carberator. It works like a plunger. Alot of times it will stick slightly open allowing just enough gas to come through to idle. To the best of my knowledge it's not a real expensive part. But if yours doesn't have one then there is trash in your carb and you'll have to clean it. Hope this helps you.

Posted on Dec 09, 2016

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Posted on Jan 02, 2017

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