Re: 90hp Mercury slow out of the hole
I'd start with a decarb. I recently purchased an '02 3 cyl 90 and after decarbing it ran much better.<br /><br />On your rpm with that prop, unless your boat is REAL heavy, or the hull covered with crud, you should be running well over 6000 which is a further indication of the engine not performing correctly. That engine has a 2.3:1 gearbox so it swings a much higher pitch than a lot of engines with the more standard 2:1.<br /><br />I am running a 24P on that same engine on a 17' aluminum bass boat and still the rpm's are at 5600.....just to give you some idea as to where you are. But my boat only weighs 750# dry, is padded, lightly loaded, with just me.<br /><br />If decarbing doesn't help you should investigate a fuel starvation problem, like a clogged fuel filter somewhere in the fuel delivery line and then have the timing checked for proper advance at WOT.<br /><br />HTH,<br /><br />Mark