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  1. T

    Carburetor tuning on muffs

    Good afternoon. Here’s a movie. I am spraying 16:1 premix to the middle carb. and I kind of hear the difference, I think. So I have at least spark? Not on this movie, but I also turned the idle screw of the middle carb and I kind of hear the difference. I don’t hear a big difference when I am...
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    Carburetor tuning on muffs

    OK. I will check the line. I am just using zip tie for the pulse line and may be I need better seal? I just ordered snapper clamps to have better seal.
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    Carburetor tuning on muffs

    Got it. Thank you !
  4. T

    Carburetor tuning on muffs

    I couldn’t get out of work till late. And it’s too tale to turn on the engine now. I don’t want to get a complain from my neighbor… I will spray 16:1 to the middle carb tomorrow and see how it goes. In the mean time, I checked all fuel lines to make sure they are all air right and shorten the...
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    Carburetor tuning on muffs

    Yes, sir. I will do that tomorrow.
  6. T

    Carburetor tuning on muffs

    Yes. They are in good shape.
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    Carburetor tuning on muffs

    Before rebuilding the engine, I disabled VRO and use pre-mix (fuel: oil = 50 : 1)
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    Carburetor tuning on muffs

    Yes. The middle cylinder was scored and I honed it. I also honed the other two cylinders and now the compressions are the same and 105 psi or so.
  9. T

    Carburetor tuning on muffs

    Yes. Butterfly valve is completely closed at idle for the middle carb. I checked the spark plug today and it wasn’t wet. I’ll recheck tomorrow, though. I don’t have an adjustable spark tester and I have ignition tester like the picture attached here. The brightness of the tester for the middle...
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    Carburetor tuning on muffs

    I removed the needle valve and sprayed good amount of carb cleaner and let it soaked for a while and sprayed again. The tip of the needle valve looked fine to me. I checked the spark in the middle carb and it was fine. Still, rpm wouldn’t change even when I turn the screw all the way in or back...
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    Carburetor tuning on muffs

    Yes, sir ! Thank you.
  12. T

    Carburetor tuning on muffs

    I will check the 3 points that you mentioned also. Thank you !
  13. T

    Carburetor tuning on muffs

    Hi tphoyt, Yes. I cleaned the carbs, but not needles. Any precautions that I should take when I remove it? I can hardly find any info about removing it. Also, how can I verify I am getting fuel to the middle carb? I will re-check the spark tomorrow on the middle carb. For reference, I checked...
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    Carburetor tuning on muffs

    On my 1989 Johnson 2 stroke (3cylinders), I was trying to adjust the air-fuel mixture. Then I noticed whichever direction I turned the screw of the middle carb, the rpm wouldn’t change. Any idea?? Maybe, the tip of the screw is broken? If so, can I just unscrew all the way to check or do I have...
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    Carburetor tuning on muffs

    OK. I will adjust on muffs and fine tune in the water. Thank you very much for the reply !!
  16. T

    Carburetor tuning on muffs

    Hi, I know it’s common understanding (I think) that the carburetor tuning (air-fuel mixture screw adjustment) needs to be performed in water. My understanding of air-fuel mixture screw adjustment is to achieve the highest rpm at idle. Can I adjust the screw on muff first and put the boat on...
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    60HP 1989 Johnson outboard low compression

    I received new coil packs and all are showing the same resistance than the ones I though bad. I guess multimeter that I have is crap… Let me check if I have spark or not when engine is warm. All I can say at this point is hard start when warm.
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    60HP 1989 Johnson outboard low compression

    I put my boat on the water and tried to tune carbs. It ran fine until I shut off the engine and tried turn the engine back on when engine was warm. I went back home and checked the ignition coils and primary coil was showing 0.3-0.4 ohm for all 3 ignition coils. Based on the service manual, they...
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    60HP 1989 Johnson outboard low compression

    Yes, sir. Let me clean the carburetors again.
  20. T

    60HP 1989 Johnson outboard low compression

    Ah i see. The water pump kit came with two different springs and new housing cover. Let me change them. Thank you.
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