Brand new Mercury 25 prokicker, EFI, mounted on the aluminum offshore bracket that is bolted to my Osprey for my outboard conversion. Bracket itself has a very heavy coating of paint and the kicker is bolted down tight. The motor is extremely quiet 95% of the time, has amazing power and is smooth as butter. However, for reason unknown to me, at salmon trolling speed of around 2.5-2.6 mph there is a fairly loud resonance. No other rpm, just ironically where it's likely going to live most of its life.
I talked to the local prop shop to see if I could get the prop re-pitched, since there's only 1 prop for this motor and it has so much power salmon speed is just off idle, but they can't adjust the high thrust props. I still need to install my prop guard and maybe that will fix it, but it sounds like its coming from the power head itself. Aside from just double checking that everything is tight, anyone have any ideas on how to eliminate that resonance or atleast move it in the rpm range? I don't think one of those vibration pads would fix it because it doesn't appear to be coming from the bracket at all.
I talked to the local prop shop to see if I could get the prop re-pitched, since there's only 1 prop for this motor and it has so much power salmon speed is just off idle, but they can't adjust the high thrust props. I still need to install my prop guard and maybe that will fix it, but it sounds like its coming from the power head itself. Aside from just double checking that everything is tight, anyone have any ideas on how to eliminate that resonance or atleast move it in the rpm range? I don't think one of those vibration pads would fix it because it doesn't appear to be coming from the bracket at all.
