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NFS-30A Races at Idle after Shutdown

S

SimpleSkiff

New member
I've got a new-to-me NFS30A -- so carved 30HP four-stroke -- that has a few quirks I'm trying to sort out. Here's one. Occasionally, after running the engine for an hour or so and then shutting it down, when I restart it, it races at idle. I don't have a tach, but I'd say the RPMs are north of 2000. As you might imagine, this makes it a challenge to get it in gear and get going again without mashing things in the lower unit. Any ideas on what might be causing this?
 
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OK. One more data point, although I am not sure what to make of it. Today, ran the boat on a plane for about 20 minutes, shut it down, restarted and after a few minutes while I was getting the anchor ready, the idle started to race again. But then (I don't remember why) I trimmed the motor down (I had trimmed it up a bit while running) and the RPMS went back down to normal. Is there a reason why having the motor trimmed al the way down -- or why the process of trimming it down -- would stop the racing?
 
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