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Idle when running on muffs

Hi All,

I just changed the impeller on a new to me GS202 with the 5.0mpi.

I started it up, running on muffs.  It seemed to start a bit harder than usual, but had good water flow.  The idle rpm after startup was close to 2000 so I only ran it for about one minute.  The boat normally idles around 900 on the water.

Is this high idle normal on the muffs, or do you think it would have dropped once the engine warmed up?  Didn't want to run it too long at the higher rpm.