Posted by ursaminor on 10/08/17 - 5:45 PM
#13
I'm pretty sure that's a Mercury part number on the propeller you listed above and a 17 pitch. On paper, you should be underpropped and running above the rated RPM. As mentioned above, I have the twin of your boat and normally ran a 19 pitch. It would run on the high end of the RPM range with a light load.
Before you run the engine a lot more, I'd get it looked at by someone that's familiar with older Mercury engines. It could be something simple and possibly just cleaning and syncing the 3 carburetors. Pull the spark plugs and take a look at them as well. If one is worn or fouled that would affect performance quite a bit.