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#5
12-17-2008, 01:03 AM
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Re: Only 4500 -4800 RPMS- 90 HP Johnson on 20'SF
If have a 15 already you don't have much going down, thats about it I think. The best idea was to raise the motor and I will bet its too low and maybe way to low. In any case, it should be 1 to 1 1/2" ABOVE the the hull bottom, you don't want to drag the cavatation plate around, that will help I bet.
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Any way you measure it - dumbass is expensive 
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