Mercury 150xl swb 2008 w/carburetors

by Bill
(Middleburg, FL, USA)

Engine is running cold (99 degrees when read by a laser thermometer) while connected to a hose. I know 2 strokes run a bit rough especially when cold but, tend to smooth out after warming up. Mine never warms up so it stays on the rough side. The thermostats were replaced 2 years ago.

Thanks,
Bill

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