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Thread: Js550

  1. #1

    Js550

    I have an old 1987 js550. It starts right up. But when it's in the water it's like there is no power. Won't even get out of the water. I have a mikuni 44mm Carb on it. What else can I do to get more power?


  2. #2
    steve45's Avatar
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    Sounds like you need to clean the fuel system. How long has it been sitting?

  3. #3
    Just over the winter. I had it out last season and it did the same thing. I just ordered a Solas prop. I just found that the prop that was on it was bent a little. Not much. Could that make a huge difference in acceleration?

  4. #4
    Quote Originally Posted by steve45 View Post
    Sounds like you need to clean the fuel system. How long has it been sitting?
    ^

  5. #5
    steve45's Avatar
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    Yes, a bent prop would certainly reduce thrust. Does it sound like it's revving up normally?

  6. #6
    When it's out out water it definitely sounds great.. but in water, it doesn't accelerate and sounds bogged

  7. #7
    steve45's Avatar
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    Carbs.

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  9. #8
    I have rebuilt the carb. Is it to much carb for the intake ? I heard you have to match the carb with the intake and pilot

  10. #9
    steve45's Avatar
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    I don't know. Did you swap carbs, or is this the way you got it?

  11. #10
    Sounds like a jetting issue to me, probably to rich

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