Has anyone dyno'd a Mercury Racing 565? Anyone know what the actual HP is close to? A 525 usually dynos closer to 540 so just wondering if the 565 is also under-rated.

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I've got a dyno someone just needs to bring a 565

Not under rated, just measured at the prop.
Don't know the number, but it would be higher at the flywheel

So the 525 and the new 565 are both measured at the prop?
I'm seeing speed increase claims much higher than I'd expect with only 40 more hp.

Yes, change to the prop (NMMA - National Marine Manufactures Assocation) was done years ago. As example, manual 23 for a 502 MPI the MCM list 415hp and the MIE list 400hp

Don't know about the claims

It says 565HP crankshaft rated.
https://mercuryracing-prod.azurewebs...engines/565-2/

Is that the front of the crank or the back?(joking) Whatever it is I want one!

OK, wonder what the manual list the hp is, because that would be with drive?
The 6.2 MPI list 350 hp as a bobtail, in a boat Merc list as 320hp in manual 31

Yep, it sure does. I looked in my 525 service manual and it also says 525 hp rated at crankshaft. Hmmm.