Peninsular prop issue

[Jeremyvmd]

Ok so I know the first question you guys are gonna ask so no I have not photo tached the motor yet (going this week to buy one). Now that I got that out of the way, lol, the problem im having is wide open my tach showed 3900-4k but only hit about 17-18knts. That seems a bit slow for the rpm. I really had to run her way more open that I thought I should be. Im wondering if A)tach is reading high, or B) prop needs a bit more pitch. Prop says its a 18x17 three blade. First and foremost I think I need to check the tach since it is new.
So questions are:
What do other peninsular owners have for props?
What is your cruise (speed and rpm) and top end?

[RobS]

What is your engines max rated rpm ?

Was your change that rpm was down AND speed was down or just loss of speed ?

[Jeremyvmd]

Max rpm is 3800. I feel like my speed is low for the rpm, I feel like she should do a few knots more. last year I was able to get a bit more "on plane" than I was yesterday, and yest I was traveling lighter, so i donno what's going on. There was no smoke, engine didn't sound like it was struggling or anything

[RobS]

Did you try and remove your new air filter assembly to see if that was involved?

[Jeremyvmd]

Unfortunately the new filter didn't fit so I have the same one as last year. But I thought maybe it was choking it off. I didnt remove it to check because of the vent hose that's attached to it...