Parker 2520 XLD w/ twin 300's?? Am I crazy?!?

Parker Boats

phanatic!

Almost A Member
Sep 9, 2009
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Fountain Valley, CA
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Danny
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15' & 21' Bayrunner Baja's & 23' Pacific
What do you guys think about putting twin 300's on a 2520 XLD? I'm considering doing this to mine since I often drive 60+ miles offshore and on many of those flat calm days I wish I could be cruising in the mid 40's but realize I can only do 30mph on my twin 200s (top speed low to mid 40s). I hear the 2820XLD guys with twin 300's are hitting 55-59mph max speed and can cruise in the low 40s.

The max rating on Parker's website for the 2520xld is 500hp. That would equate to twin 250's. I tried to get my local Parker dealer to power my 2520xld with twin 250's from the factory but he said he couldn't do it even if he wanted to. Parker just won't install any more than twin 200's on a 2520XLD. The difference in weights between a twin 300 and a twin 200 is an additional 136lbs. I have read some guys on the forums installing twin 250's without any problem.

Since the Yamaha 225, 250, and 300's all weigh exactly the same, what's stopping them to allow us to power twin 300s? Is it not fuel efficient? Is it not safe? Will the bracket not handle the extra power? 2520XLD weighs 5800lbs. 2801CC weighs 5000lbs and has 600 max hp rating. 2820XLD weighs 6400lbs at 600hp max rating. Can anybody explain why this is so?
 
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angelinasdad

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May 23, 2006
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Anthony
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Parker 2320
That would exceed the coast guard rating for the boat. I would assume the other possible issues you noted could also be true. You might even have an insurance issue exceeding the max hp rating on the boat. I would love to hear what other say. I assume the dealer would repwer to twin 250 hp since that is the max rating for the boat?
 
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djam

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Jun 2, 2008
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Dave
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Parker 2320 (Terabite)
I was told that most insurance will decline to insure you, and if they do they will use that as an excuse to not pay.

If you are in SoCal, not sure that you will hit that top speed very often without buying your dentist a new boat.
 
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ShadBurke

Just a Guy and his Boston Whaler
Oct 28, 2005
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Shad Burke
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22' Boston Whaler Guardian
600 Yamaha horsepower is a beautiful set up on the proper platform. A 25’ Parker is not that platform.....

And my insurance doesn’t have any issues with my overpowered Boston Whaler 22’ Guardian with a Yamaha F350 outboard...

D0952B89-64E1-47B9-81AC-AD6916A4FE35.jpeg
 
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knot keely

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Aug 9, 2014
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phanatic!

Almost A Member
Sep 9, 2009
124
13
Fountain Valley, CA
Name
Danny
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15' & 21' Bayrunner Baja's & 23' Pacific
That would exceed the coast guard rating for the boat. I would assume the other possible issues you noted could also be true. You might even have an insurance issue exceeding the max hp rating on the boat. I would love to hear what other say. I assume the dealer would repwer to twin 250 hp since that is the max rating for the boat?

Yes, the dealer has no problem installing twin 250's. However, I wish Parker would have done this from the beginning.
 
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427mandingo

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May 1, 2012
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Marin County
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Manny
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Crooked Hooker
The 2820 does fly with new 300’s. Hitting 55mph was not a problem but best mph was at 40mph which is flying. It makes sense since the 2820 is only 600lbs heavier than the 2520 why it’s so fast when the max on a 2520 is rated at 500hp max
 
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mutu0069

CEO of my own Domain
  • Oct 7, 2006
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    los alamitos
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    brian
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    whatever floats
    There’s a late model 2520 XLD with twin 300’s listed at Executive Yachts. It does have a Seakeeper so could be why they went with bigger motors.
     
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    Nic

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    May 4, 2006
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    Nic Miholich
    Boat
    2510 parker, Split-Fin
    I have been running my 2006 2510 parker for 11yrs with 2006 250,s. Perfect power!
     
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    May 13, 2004
    496
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    Long Beach and points due west
    Name
    Bob Ballew
    Boat
    2520 Parker with twin 200 Yamahas
    My 2520 DV is plenty fast with twin 200 Yamahas. Tops over 40 mph fully loaded. Ocean conditions seldom allow you to to go that fast. Do some research on the 300's wherein there were mechanical problems with some versions of them. Me, I would stick with the suggested h.p. ratings as designed by the Parker team...also, check with your insurance carrier to determine if ignoring the ratings would void your coverage in the event of an accident...without suspension shock absorbing seats, it would probably beat you to death in a 4' swell.....speed is good 'til it isn't ....:)
     
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    outdorfan

    Almost A Member
    Jun 28, 2005
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    Tustin
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    Jim
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    Parker 2510 DV "Officina"
    Just a little food for thought based on my experience upgrading my power. It was widely debated 3 years ago on the "value" of switching from a 2 stroke 250 yamaha to my current 4 stroke 350 suzuki on my 2510 with a transom mount. It flies on flat calm days and cruises with improved handling and efficiency on our many runs to the local islands. Like the OP said, Parker was not helpful in making the decision and basically between myself and my fabrication guy we designed the right support bracket and couldn't be happier with the upgrade. Plenty of power and no issues with the increased transom weight. Would love to see a video of the 2510 with twin 250's mentioned above running on the water though!!!

    350.jpg


    big bass.jpg
     
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    JGlass77

    Newbie
    Dec 19, 2020
    7
    3
    43
    Oxnard
    Name
    James Glass
    Boat
    Parker 2510
    Just a little food for thought based on my experience upgrading my power. It was widely debated 3 years ago on the "value" of switching from a 2 stroke 250 yamaha to my current 4 stroke 350 suzuki on my 2510 with a transom mount. It flies on flat calm days and cruises with improved handling and efficiency on our many runs to the local islands. Like the OP said, Parker was not helpful in making the decision and basically between myself and my fabrication guy we designed the right support bracket and couldn't be happier with the upgrade. Plenty of power and no issues with the increased transom weight. Would love to see a video of the 2510 with twin 250's mentioned above running on the water though!!!

    View attachment 1245092

    View attachment 1245093
    Talk to me about your fuel consumption from a 250 2-stroke to a 350 4-stroke. I have the same boat a 2510 deep V transom mount. I am planning on repowering next year.
     
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    outdorfan

    Almost A Member
    Jun 28, 2005
    137
    65
    Tustin
    Name
    Jim
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    Parker 2510 DV "Officina"
    I don't have any specific fuel economy numbers as I haven't run many long range trips to get an accurate read but in general the old Yamaha was a 2000 OX66 that was always thirsty and the new Suzuki DF 350 with the dual prop gets up on plain much quicker and runs more efficiently which has helped a lot. The concern that many voiced when I was doing my research was the added weight on the transom and how that would affect performance and fuel efficiency and I found those to be non issues. We spend quite a bit of time discussing and designing a stainless steel transom cap that ties in to the stingers and boat boxes on either side of the transom to accommodate the extra weight and thrust and my fabricator hit it out of the park with the finished product. Bottom line, I would have no issues recommending this upgrade to someone based on my experience.
     
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    JGlass77

    Newbie
    Dec 19, 2020
    7
    3
    43
    Oxnard
    Name
    James Glass
    Boat
    Parker 2510
    I don't have any specific fuel economy numbers as I haven't run many long range trips to get an accurate read but in general the old Yamaha was a 2000 OX66 that was always thirsty and the new Suzuki DF 350 with the dual prop gets up on plain much quicker and runs more efficiently which has helped a lot. The concern that many voiced when I was doing my research was the added weight on the transom and how that would affect performance and fuel efficiency and I found those to be non issues. We spend quite a bit of time discussing and designing a stainless steel transom cap that ties in to the stingers and boat boxes on either side of the transom to accommodate the extra weight and thrust and my fabricator hit it out of the park with the finished product. Bottom line, I would have no issues recommending this upgrade to someone based on my experience.
    lol....I have a 2000 OX66
     
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