I'm glad to be reading this thread about the Mercs being so loud and sounding like they're about to die. After getting my motor running right, I've not been satisfied with the sound of it at idle. My old Johnson idled like a sewing machine too. Smooth as silk. You could hear the telltale splashing water! This Merc beast though sounds like it's about to croak, the thing shakes a little and is REALLY loud, but touch the throttle and it revs up like a chainsaw on race fuel.
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