When idling the rpms rise?

2nd chance

Cadet
Joined
Mar 20, 2009
Messages
17
WHY Idling then rpm rise ??

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I have 2003 honda 40 hp 4 stroke this year after putting in water it was setting by dock idling about 900 rpms when I returned after parking trailor
I notice idle had gone up a lot to 2000-2100 rpms shut engine off waited a while while on phone then restarted it ran 900 for a few min then up to 2000 again the motor was winterized by local honda dealer last winter only thing I did this year was put in 3 new plugs which I do every year in any of my outboards anybody ever had this problem????
 
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