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  1. J

    Johnson Looper V4

    Today I ran it off an external tank, and had the same problem
  2. J

    Johnson Looper V4

    Here is a video clip of the problem I’m having at WOT. I put in larger sized main jets (64d). The starboard side has #27 mid and #37 idle. The port has #27 mid and #34 idle. I can get the boat on plane and it will now get slightly past 5000 rpm’s, but after a few seconds the rpm drops off...
  3. J

    Johnson Looper V4

    Running with VRO, and I just installed an entire brand new VRO pump. Idle timing advance I have set to 8 deg atdc Max spark advance I have set to 18 deg btdc using the Reeves method. Haven't had a chance to take it out to check wot with a timing light.
  4. J

    Johnson Looper V4

    Agreed, but it was for 2 sec to see if I can make the rpm. Compression on all cyl is 118-120. New coils, wires and plugs were installed as well.
  5. J

    Johnson Looper V4

    Boat sat for a long time. Drained the gas from the tank, cleaned the carbs, and did the link/sync. Right now the boat will idle for about 5 min or so, then it shuts down. Out on the water I can get up on plane at wot I get 5000 rpm initially, then the rpms decrease to 4500 and stay there at...
  6. J

    Johnson Looper V4

    Cool! Thank you! What would the intermediate air bleed size be? Are all 4 intermediate bleeds all the same or different between port and starboard?
  7. J

    Johnson Looper V4

    Sure thing! It is a VJ140TXEID. 140HP 90deg
  8. J

    Johnson Looper V4

    Hello, What would be the correct factory setting jet (orifice) sizes for a 1991 Johnson V4 looper engine (idle, intermediate, high)? Also, can someone please explain why there are different sized jet (orifice) sizes on the port and starboard side? I’m at sea level elevation. Thanks! JH
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