x3 on raising the motor. Fix the prop, service the lower, and check the latches on the outboard cowl. My Johnny started to rattle and it turned out to be the latches. Glued in a thin piece of rubber to keep the latch quiet. Lost the rubber and discovered that the silicone caulk served the same purpose. Found it while poking and prodding around back there while on plane, actually put my hand on it to keep my balance to lean over the back and the noise went away. Second best guess would be the exhaust can rattling around if the mechanic didn't put it all together correctly, maybe he forgot the rubber at the bottom of the exhaust where it goes into the lower.
I do not believe you will see many more RPM from motor height adjustment. Something else, maybe the prop, your rpm is off by over 1000.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
Last edited by RidgeRunner; 11-10-2011 at 08:54 AM.
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