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  1. #1

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    Best way to tune carbs on a Wave Venture 1100?

    I have a newly rebuilt motor that was just broke-in and it seems to run great from bottom to top. Plug readings are identical tan to light brown.

    However I want to make sure my jetting is right for safety reasons and best performance as I'm new to PWC and multi cylinder engines.

    My needles are set at service manual spec but boyesen suggests this -

    I put boyesen reeds in this motor and an instruction pack came with them giving some really good straight forward instructions on how to tune these mikuni carbs. Although it is talking a bout a single carb it states the same basic procedure for multi carb set-ups. I guess just adjust them all identically.

    It says, have the boat in the water warmed up on the trailer and at idle turn the L/S needle IN/OUT from factory setting till the motor revs to it's highest and if you go to far then it will start to fall off. at that point go back to where it's revving to it's highest and leave it there. obviously do this with 3 carbs and try to get them even.

    Then, run it and come to the dock and go to the H/S needle and turn it 1/2 turn out or richer and run it. If it runs worse then go the other direction or vise-versa etc.... Once you've found the optimum power, turn out 1/4 turn and your good.

    Does this sound like a good way to tune to you?


  2. #2

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    On most of the twin and triple cylinder yamahas they have different settings from one carb to the next. If you have no mods, and there are very few for a venture anyway, the way to go is set the carb screws exactly as stated in the yamaha service manual. Here is the settings for your model right out of my WV700/WV1100 manual.....H S jets carb 1 107.5, carb 2 95, carb 3 107.5. L S jet all carbs 75. Low speed screws all carbs 1 1/8 +/- 1/4. High speed screws all carbs 7/8 +/-1/4.

  3. #3

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    Hi thanks for the response. The jets are as stated, I checked while rebuilding the carbs. I did set the needles to spec but I have a quarter turn or so to play with.

    Anyway, my main concern is my plugs are burning a little light for my taste. However, I've been running the machine with no intake cover or flame arrestors, just open carbs so I could get to the needles for adjustment if I needed. Do you think this created a lean condition with needles at factory settings?

  4. #4

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    Probably not, unless there is another problem going on. Plugs take a long time to develop color.

  5. #5

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    Jul 2014
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    Well I richened both the L/S & H/S needles a 1/4 turn out and installed all the intake. I ran it for about a half hour and the plugs looked exactly the same, lol... They did look to burn a little more even around the periphery than before but that could be a combination of things...

    Anyway, I ran it hard thru 10 gallons of gas and it didn't seize so I guess it's good. The idle seems a little rougher than before even when I raise or lower it so I may tinker with that a little in the future.

    Thanks for the input, overall the boat runs real strong!

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