Re: yamaha 150 4-stroke prop?
I don't hit 60 mph, but running my nearly 1800 lb 20' Seafari with jack plate, nosecone; jacked and trimmed, I turn my '92 Merc 150 carb at 6000 rpm's and 43 kts (about 50 mph)
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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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