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I've got a Parker 2510 DV with a 1999 Yam 250 turning a 17 pitch factory ss prop.
At WOT'5300 rpm's I get abot 32 kts
At 3800 rpm I get 20 kts (most efficient cruise)
At 4300 rpm I get 22-24 kts (If I want to get home quicker)
It also can plane at 3200 rpm's at aabout 12kts.
I'm considering replacing the 250 with a 225 4 stroke.
Does anybody have an idea on how my performance would change ? I', guessing I'd drop about 2kts at all ranges. Other than that I cant think of any "downside".
FWIW....I have the 2002 23'SC/DV with an F225 on a bracket. I also have the factory 17 prop. I carry a lot of "stuff" on the boat, it's heavy, and would not want a smaller motor. If it were the XL or MV ok....but I would be leary if the F225 would be enough for a DV 25. Just a thought...
I have a 225 four on my Edgewater and it is a great match for my boat, but IMO it isn't going to be enough for your boat, although I have seen that setup on the water.
Go to parkerboats.net and ask Robin if a single F225 is sufficient power for the 25 DV. Took a test ride on a 2520 MV with a single F225 and I'd consider the power mimimun. The DV requires more power.
I have a F200 on a Grady 20. I've been on a 25 Many times with a 225 Optimax--that is minimal power in my opinon. Also, been on a 25 Parker with F115s. It worked well, but slighltly underpowered.
The more you guys try to talk me out of it the better the idea sounds.....
Chunga.. 40 is moving !! I wouldn't be unhappy if my WOT went from 38 to 34 or if my cruise went from 22 to 20 or 20 to 18. Parkers are not speed boats. In 4ft seas I usually do about 17-18 kts.
I am really interested in how quiet the 225's are. With a hardtop, that 2 stroke 250 is loud. The fuel economy is another factor.
Robin says you can do it on a DV sport cabin but not a DV WA because it is 500 lbs heavyer. Heck 500 lbs is 70 gallons of fuel (I wont need !).
Also, I figure I can swap motors while my 1999 still has decent value. The other nice thing is that the controls and wiring harness from the 250 plug right into the 4cycl. 225.
Yamaha 4 stroke 225 replacing Yam 250 2 stroke 
