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I've got a 90 merc. 4-stroke on my 190. I'm running a aluminum 13 1/4 x 15 pitch prop
and mine planes with no problems with 4 adults, full tank of gas and fishing gear. It tops out with all the above at 37 mph at 5900 rpms. It will do 39 at 6000 rpms with only 2 aboard.
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