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Question on Balancing 1997 S150 Carbs

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  • Question on Balancing 1997 S150 Carbs

    My gummed carbs are on the bench. After cleaning / rebuilding I understand they should be balanced, best with vacuum gauges. I am not sure if I have the required intake vacuum ports. See pics. Each of the intakes has a "nipple" with a vacuum line attached. The vacuum lines go to whatever the pictured component is under the fuel filter area.

    Should I / Can I disconnect these lines to get the balancing vacuum gauges connected?

    Or must I balance with no gauges but using the eyeball on the butterfly method as described in the service manual?
    Tom P in Sunny Virginia Beach, VA
    1997 Yamaha S 150 TXRV on a
    1997 Scout SportFish 192

  • #2
    Do u have the yamaha repair manual for the motor. If so it should show the procedure for syncing the carbs without vacuum gauges.

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    • #3
      Those are oil lines !!

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      • #4
        Do not take the oil lines off of.your motor!! You need.the manual to do a link and sync. Carb balancing is for 4 strk motors not 2 strks.

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        • #5
          Thanks guys
          Tom P in Sunny Virginia Beach, VA
          1997 Yamaha S 150 TXRV on a
          1997 Scout SportFish 192

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          • #6
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            Those are the oil injection lines.-----On a 2 stroke you do not need to use vacuum gauges.

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