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Yamaha 4.3L Exhaust Manifolds

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  • Yamaha 4.3L Exhaust Manifolds

    Good morning,

    I am just in the stages of replacing the 4.3L GM in a 93 Rinker I purchased. It has a Yamaha sterndrive setup which, until recently, I was unfamiliar. I now realize that parts are not easy to locate. I have a cracked exhaust manifold. Does anyone know where I can come up with an exhaust manifold for a Yamaha 4.3L set up or is there a reliable way to repair?

    Thanks in advance.

  • #2
    Ayuh,.... Welcome Aboard,.... I believe yer only option is to adapt a set of Merc manifolds,....


    • #3
      Thank you. Lots of good information here. Adapting over is what I was starting to think. I can't seem to find anything anywhere. I am planning to call Capt Ken tomorrow. Are there any Merc adapter kits you would recommend?


      • #4
        Ayuh,.... I doubt there's any "Kit",....

        The motor side will be the same,....
        You'll need to figure out which risers ya need to mate up to the Yamaha y-pipe though,....
        Diameters, angles, 'n lengths are the variables,....


        • #5
          There is no kit. You pretty much buy the merc manifolds and risers and gasjets and modify your y pipe as needed
          1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

          Past Boats
          1970 Wooster Hellion - Merc 9.8
          2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
          1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

          What’s behind you doesn’t matter.Enzo Ferrari


          • #6
            Got it. Thanks. I guess I will start getting measurements around.


            • #7
              I've done the swap for the 5.0/5.7 and 77searay197 has done a 4.3. I even did a Youtube video to show the setup. You have to reuse your risers. I posted a write up on the things used with some part numbers for the 5.0/5.7.


              • #8
                Hope this helps...



                • #9
                  Thank you Antax!


                  • #10
                    Hi Trent
                    I am in the same predicament as you. What did you end up doing?


                    • #11
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