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Idling Too Fast!

bf92

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I flew my son's PItts S-2A the other day, first flight out of its recent annual inspection, and upon landing I couldn't get the airplane slowed down as it normally does. I went around and made more of an arrival than a landing because the a/c simply would not slow down. In taxiing in the engine was idling at 1,300rpm with the throttle fully closed. Never happened before! Visual inspection shows the throttle butterfly full closed, the idle stop still set where it was, no induction leaks, no changes in anything mechanical, just idling too high. Any suggestions on how to troubleshoot this issue?

Danny
 

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