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Thread: Yamaha F250

  1. #1

    Default Yamaha F250

    Who has one? What do you get for fuel efficiency? What prop do you run?

  2. #2
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    You need to provide more info. What type, length and weight of boat are you putting one on? I am running a pair of the older F250s on a 30 foot aluminum. With 4 blade stainless 14.25 x 17 props I burn a combined 23 gph going 30+mph at 4600rpm.
    Spending my kids' inheritance with them, one adventure at a time.

  3. #3

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    I have a single 2006 F250 hanging off the back of a 24ft SeaSport Explorer. Mid range weight is probable close to 6500-7000 lbs. The boat came with a painted yamaha SS 13.75 x 19 prop. With that set up I could get 6000rpms WOT, cruise at 5000, 27mph, 1.7mpg(15gph) and would fall off step at 4600-4700 regardless of what I did with the Trim. Last year I went to a mercury AL black max 15.5 x 18 - WOT 5600, cruise at 4800, 27mph, 1.9 gph, (16gph) and could hold it on step at a lower RPms (4400).

    I want get better fuel econ and keep to boat on step at lower RPMs. Thinking about trying to find a 15.25 x 19 SS to see what that will do.

  4. #4
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    Nice setup. I know that yamaha wants you to be between 5500-6000 at WOT. Stepping up in pitch and jumping from aluminum to stainless will usually drop your RPMs further. Perhaps a 17 pitch? If you are located in Anchorage, A-1 props will let you try out props.
    Spending my kids' inheritance with them, one adventure at a time.

  5. #5

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    I did try a 17 AL with pretty close to the same #s as the 19 SS. Maybe a 17 SS? I'm in Sitka.

  6. #6
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    Quote Originally Posted by akroxy View Post
    I want get better fuel econ and keep to boat on step at lower RPMs. Thinking about trying to find a 15.25 x 19 SS to see what that will do.
    Surprised at your fuel burn numbers and it makes me think perhaps you need a bigger motor for that much weight. I am running the same boat but with an I/O 496/375 hp and duoprop and we cruise at 27-30 mph at approximately 3,000 - 3,100 rpms and average 2 to 2.2 mpg with three adults and tons of fishing gear on board and a full water tank (25 gallons). We can get on step within 3-4 seconds and stay on step as low as 15-17 mph.

  7. #7

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    I agree it needs more HP but it is what it is with less than 300 hrs on it. I'm not that far off from what you cruise at Snowwolfe. I can cruise all day long in good water with a mod-heavy load at 1.9mpg (48-4900rpms), but starts plowing water 44-4500 rpms. Wishing I could get 2-2.5mpg and keep it on step in the lower RPMs

  8. #8
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    We put a 3.3L F250 on a 24XL a couple years ago, we propped it with the 15 1/2 x 17 Stainless Yamaha Prop. The RPMs ended up pretty close to 6000, I think that was a good match for that hull.
    Casey
    Yamaha Dealer
    Petersburg, AK

  9. #9

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    Thanks Akfish1

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