Yamaha F40 hp WOT - I only ever reaches 5,000 rpm

Discussion in 'Outboard Maintenance' started by jaxflatsfisherman, Jul 8, 2009.

  1. jaxflatsfisherman

    jaxflatsfisherman Well-Known Member

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    All of the performance bulletins show this engine maxing at 5800+/-.

    I realize that it might be the prop I have, but I do not have the ability to try different props. My concern is that my throttle linkage is not letting the throttle reach wide open? Is this something that is easy to adjust? Thanks
     
  2. mark_gardner

    mark_gardner I Love microskiff.com!

    should be easy to adjust. a manual might help
     

  3. iMacattack

    iMacattack busy, too busy

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    I think the first part of your statement might be the head of the nail. What kind of boat and what kind of prop. I would not fiddle with linkages just yet.
     
  4. jaxflatsfisherman

    jaxflatsfisherman Well-Known Member

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    3 blade Mercury Vengeance 48-855862 A 5 15P
    10 1/4 Diameter X 15 Pitch

    Boat is a Whipray 16

    Thanks
     
  5. iMacattack

    iMacattack busy, too busy

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    I'll have to check the prop on the Waterman, but it has an F40 tiller, spinning a Power Tech.

    Give me a day or two to check the prop.

    Cheers
     
  6. nicklarson

    nicklarson Well-Known Member

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    If you want to check if your linkage is good take your hood off and put your throtle wide open. Look at your carb(ohh and take off your air box) and see if your butterflys open all the way if not then fittle with it.
     
  7. el9surf

    el9surf Well-Known Member

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    I had a similar issue on my hpx15. Max rpm was 5000. A year later the dealer realized they had the wrong prop on the boat when they sold it to me. I got a new powertech for free and it opened my rpms up to 5800. More importantly the boat jumps on plane now very quick.
     
  8. PVredfisher

    PVredfisher Well-Known Member

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    I have the same motor and turn can turn my 3-blade to 5500-5600. I would say talk to a prop shop. I have to look at my prop, but i will let you know as i am pushing a similar load compared to your boat.
     
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