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  • drop down test

    Compression reading results;
    #1 @ 134 / #2 @ 136 / #3 @ 140 these reading are taken with a different gauge the previous results posted.
    Ignition test = good firing at all Cylinders & a good spark jump

    Still no drop in RPM's when #1 gets unplugged, so then it can only be fuel related? pump pressure?

    Sprayed a quick squirt of brake-cleaner into #1 carb. and it surged!
    (DISCLAIMER; this is NOT a good practice & not recommended, just to clarify for the folks that don't know this)

    This would indicate to me a fuel-issue, so I adjusted the fuel/air mixture screw to 1&1/2 turn out(from 1&1/8) revved the engine a couple of times to get adjusted.

    Would you believe?!? it made it run on the top Cylinder meaning; the RPM's drops down now when I unplug #1

    Someone's theory & explanation is greatly valued
    "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

  • #2
    The top carb needed adjusted. Probably the others also need tweaking.

    The screw you adjusted is for idle mixture.
    BOAT SPECS | FORUM HELP | STARCRAFT FORUM | SHOP iBoats
    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

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    • #3
      Verify that #1 carburetor is clean !

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      • #4
        lol I'm aware of the Idle mixture screw, you think the float on the top carb. is not working right?

        I'll have to clean it again,I bought a pressure gauge for the fuel-pump. so at full cranking speed check the out put pressure?
        "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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        • #5
          If the pressure gauge works when you try.
          It might show 2-3# of pressure.

          It's possible the needle/seat is stuck, not letting fuel through.

          The needle, does it have a rubber tip or solid tip?
          The solid needle/seat has a tiny o-ring in the bottom.
          The fuel additives//cleaners can make the o-ring swell and shut off the fuel.

          Set the float level? and drop?

          What rpm's you getting at wide open?


          Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.
          ​Tools to make my life easier: Battery tester, die grinder, temp.gun, compression tester, DVA meter.

          In Scenic , Beautiful San Sebastian by the sea Florida

          88 Bayliner 21CC 2001 Mercury 225 HP EFI

          PLEASE,NO PERSONAL MESSAGES IF THE QUESTION CAN BE ASKED ON THE OPEN FORUM I WON'T ANSWER AS MY SYSTEM CAN'T REPLY TO YOUR EMAILS

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          • #6
            good morning Jerry,
            Thanks for tuning in, the needle has a solid tip / the float level is bang-on & the drop is enough for the needle to let fuel by.
            (Pressure checked by mouth)

            the motor hanging a test-tank, so I can't check rpm's wide open
            "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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            • #7
              You have spark checkers?

              Since it's the top carb, you can reach the screw holding the bowl.
              Undo it and squeeze the ball and see if gas comes out.

              Primer or choke?
              Primer can be feeding excessive amounts of gas.
              After starting, pinch off the feed from the primer.

              Inspect the reeds?


              Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.
              ​Tools to make my life easier: Battery tester, die grinder, temp.gun, compression tester, DVA meter.

              In Scenic , Beautiful San Sebastian by the sea Florida

              88 Bayliner 21CC 2001 Mercury 225 HP EFI

              PLEASE,NO PERSONAL MESSAGES IF THE QUESTION CAN BE ASKED ON THE OPEN FORUM I WON'T ANSWER AS MY SYSTEM CAN'T REPLY TO YOUR EMAILS

              Comment


              • #8
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                Good idea! I'll check the top carb. that way
                -good spark, jumps 1/2'
                -choke
                -reeds are mint
                thank you Sir
                "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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