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Not sure if this is a concern or not.After the tractor gets good and hot,like about a 1/2 hour of use, the idle speed increases like clock work around every 15 seconds.It doesn't matter if the tractor is sitting idling or moving across a field, the idle runs up to about 2500 rpm and drops back to normal after 4 or 5 seconds.It has done this as long as I have owned it,around 4 months.
Any ideas would be appreiciated.