F115 low rpm

[lictol455]

I have an '04 Key West 186 center console with 2004 Yamaha F115 and I can't seem to get up to 5,000 rpm. very slow to plane. Frustrated! Numerous posts indicate the sweet spot is between 5000 and 6000 rpm. Is this a computer or fuel management issue? Wrong prop? looks like a 17 prop. Any advice appreciated.

[TownsendsFJR1300]

How long have you had the boat?

Did it ever rev to approx 6,000 RPM's?

Sounds off hand like the wrong prop.

Check out this site, its pretty accurate:

Outboard Performance, Performance Bulletins | Yamaha Outboards



As a side note, when I re-powered in 07, the dealership put the wrong prop on it and my boat did EXACTLY what yours is doing.
It was such a dog accelerating, would barely touch 5K @ WOT.

Went to a prop shop, got the correct SS prop. Completely different boat/engine! Almost as quick as my old 2 stroke 150 out of the hole, jumps on plane in maybe 4 seconds... WOT is about 45 MPH per the GPS @5800-5900 depending on trim.