Re: opinions...2001 evinrude 150
There are a variety of decarbonizing chemicals out there, most of them pretty good, although I'm slightly partial to Quicksilver/Mercury PowerTune
One trick I learned was to spray the stuff into the intake while running WOT in gear. Nothing works better except an engine tear-down.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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