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Mercury 115xs with x7 prop midrange motor miss.
New pro team txw 195, motor mounted in 2nd hole, pad to prop 4 inches. At about half throttle and adding trim motor shakes as though it has a plug Miss. motor runs great at idle and at wide open and only shakes at a certain trim. It does it with the stock 21 pitch black max aluminum, 21 stainless three blade, and my 19 pitch spitfire stainless x7. Seems to be cavitation at a certain speed, trim level but shakes the motor bad. A guy has a Video in the Mercury 4 stroke forum that is doing what mine is doing. Would moving the motor up or down cure this. Are we the only ones having the midrange prop cavitation, or is this a 4 stroke thing? Thanks for any suggestions. I get 49 mph at 6200 rpm and have good water pressure at that speed.
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Does that boat even have a pad? If not might have motor to high.
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