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Yamaha Wave Venture fuel/carb problem?

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  • #1

    Yamaha Wave Venture fuel/carb problem?

    Hello, After installing a SBT 1100 in this ski I'm having a problem with high power operation. The thing idles fine but stalls when adding throttle. I brought it back into the shop and pulled the carbs and fuel pump. I put a kit in the fuel pump and went through all of the carbs. Everything is clean and per the book. I replaced a couple of diphrams that didn't look so good. The pop off pressure is about 62 on all 3 carbs. I checked the fuel pump check valves and found no leaks. I tested the pump on the ski and it does move fuel while cranking. I restricted the end of the hose and it does build up some pressure but I question if it's enough. I didn't change the filter but it didn't have any water in it and I can pour fuel out of the "out " bib and it seems to go right through.
    I ran the ski again today and had about the same performance. I found that I could get to high power operation by pulling the choke out for the first 1/4 throttle and then pushing it back in and the ski wouldl take off for about 200 yards then die. If I retard the throttle at high power it will also die. It seems for the world like it runs out of fuel. any thoughts? Fuel pressure? If I hooked a fuel pressure gage to the out line and cranked the engine what kind of pressure would be normal? John BoatWerks LLC
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  • #2
    Re: Yamaha Wave Venture fuel/carb problem?

    I thought pop off pressure should be 35 - 40 for that motor.
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    • #3
      Re: Yamaha Wave Venture fuel/carb problem?

      Agree.. sounds like you are running lean, so you need to be very careful you don't lock up the motor. I assume you removed and cleaned both the high and low jets when you went thru the carbs??

      Also - do you know why the first engine failed? Always good to know or you may ruin the new one as well.

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      • #4
        Re: Yamaha Wave Venture fuel/carb problem?

        First, UB is right - your pop off is way too high. Second, you did not properly rebuild your carbs. You can not 'clean' the carbs. Get three SBN rebuild kits and properly go through them. Watch our videos and read our tech guide if you have questions about them.
        SBT Tech Support is here to help with your problems.
        We try to answer each question quickly and accurately.
        Please do not use Private Messaging for Tech Support, use the forums.

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        • #5
          Re: Yamaha Wave Venture fuel/carb problem?

          You're right I did not replace needles and seats I only inspected them, I did remove all jets and cleaned them and insured all passages in the carbs were clear, also replaced gaskets and 2 of the 3 diaphrams, cleaned filters, etc. This is not the set of carbs from this ski but they are from another 1100 Yamie. My main question now is where should the pop off pressure be set. The kits I have have some springs in them I think. What color (strength) should the springs be. Any help would be appreciated. Thanks John BoatWerks

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