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Hey thanks for the feedback, I'm in even deeper now however. They pulled the heads and they were pretty clean no scale and only moderate carbon bulidup- but no blockage. The shop (Yamaha Dealer) is waiting for new gaskets and they are going to button her back up. I am not sure what the next...

I have a 150HP 2 stroke motor on 1994 Grady White. had the carbs cleaned out and ran it 6 times on Cape Cod few weeks ago and and it ran flawlessly. I brought it back to NY two weeks later and started it in my driveway with earmuffs on and I noticed no cooling pee stream and the alarm then...