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15hp 2 stroke yamaha outboard

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  • 15hp 2 stroke yamaha outboard

    On a 15hp 2 stroke Yamaha outboard what are the 2 small rubber pipes for, that are attached to the cylinders. One goes to the reed valve block, and the other ???????

  • #2
    Without a photo, my first guess would be those small black rubber oil circulation lines that move oil from various areas to others improving lubrication....

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    • #3
      thank you Robert

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      • #4
        Hello Robert, may be you can offer some advice to me about my 15hp 2 stroke Yamaha outboard. My problem is that when I start the outboard it will idle OK, but when I advance the throttle the engine will run rough and cut out. I have replaced the Carburettor, CDI unit, high tension coils and leads ( all off another motor that is functioning quite well) and the same problem occurs. I would appreciate any advice on how to eliminate the problem. It becoming quite frustrating. I would appreciate any help that you can offer.

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        • #5
          First thing is a compression test.

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          • #6
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            compression all OK

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