RPM Concerns!!!!

[Pescado48]

Hey All hoping I can get some help here...

Ran the boat for the first time this year with a new tach, replaced as was not working last year.

My concern is the high RPM's I can get to without the hammer down...I'm at 4800rpm and doing about 28mph with still quite a bit of throttle left. Last year I was reaching speeds of 36-37mph but the tach was not working so not sure about the rpm's. It seems to me that I could easily go over the rated RPM at WOT. Not sure what to do here...I'd like to get back to 36mph...I don't want to risk damage to the engine to see what my RPM's are at with the hammer down...any thoughts?

Here are some spec's

-2004 Merc I/O 3.0l (can't make out the numbers on the air filter cover)
-prop quicksilver 1916P19
-alpa1 gen 2 drive ratio 2:00 serial number 0W518566
-21' cuddy 2250lbs

 

[Fun Times]

First you may want to double check to see if your new tachometer gauge may need to be re-adjusted to your engine cylinder size of 4 cylinders.

There should be a dial on the back of the gauge that typically has an arrow that you'd turn to the number of cylinders you have. 4, 6 , 8 for stern drive type tach's.

 

[Pescado48]

thx fun times...checked the back of the gauge...all good.