Bought a JD 165 hydro a few weeks ago. I read this on another post talking about the same thing . when I get it started it revs up well past the rated rpm for the fb460v on it and the only way to bring it down is to shut it off. When I bring it up to full rpm the butterfly opens fine but doesn't close when I bring it down. Do I have to take the engine apart to fix it? If so what do I have to fix?
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