Wave Jammer motor questions
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  1. #1
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    Wave Jammer motor questions

    I noticed that the nipple going into the pto cylinder has corroded away and he hose is just sitting there. What are the hoses for? IMG_0092.JPGThis pic shows the hoses I am talking about but it's not my motor. The motor seems to run anyway with in disconnected , but curious if I need to fix it?

  2. #2
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    Re: Wave Jammer motor questions

    Anyone?

  3. #3
    Frequent Poster JustStandups's Avatar
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    Re: Wave Jammer motor questions

    I don't work on Yamaha's much so it took some googling to find this one. They look like either oiling or vacuume hoses that connect to the bottom of the crankcase at the intake port and then to the boost ports near the top of the pistons. With these disconnected you will have a big vacuume leak and will probably seize the engine. I would not run it till you reconnect the hoses.

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  4. #4
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    Re: Wave Jammer motor questions

    Yeah I struck out on the google. Figured some sort of vaccum line. Now just have to figure house to repair it. Thank you

  5. #5
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    Re: Wave Jammer motor questions

    My best guess is that they collect excess oil that pools at the bottom of the crankcases and vacuum sucks the oil into the boost ports, the 500 was a converted outboard engine so Yamaha may have felt this mod was necessary, depending on the damage you could probably drill and tap the boss for a screw in fitting to fix the issue.
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  6. #6
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    Re: Wave Jammer motor questions

    I actually removed a nipple from a Kawasaki oil pump and drilled out the fitting and pressed the little nipple in. The fitting is a one way valve actually allowing vaccum or oil up into the cylinder. Thanks for the help

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