Recent content by M0bi0us0ne

  1. M

    Erratic tachomether

    UPDATE: So I got a cheap tach from Amazon, which behaves exactly like my old one. Above 3k, it starts jumping around. I have a USB socket with a built-in voltmeter that shows a stable value when the tach bounces around. If the Vreg was dying, shouldn't that also be jumping around? My...
  2. M

    Erratic tachomether

    The ring is plastic, really worried about cracking it
  3. M

    Erratic tachomether

    Trust me that is normal for the fuel gauge especially past half tank. If there are no waves and the boat does not move it stays perfectly stable
  4. M

    Erratic tachomether

    Crazy idea, is it possible that after 50+ years, my tach simply broke? How do I open it? There are two screws in the back, but they simply release the mechanism inside. I can't figure out how to open the casing. Is it sealed or glued?
  5. M

    Erratic tachomether

    I do have a point, I will check it
  6. M

    Erratic tachomether

    No clue, I replaced the ignition coil, and that did not help. The VReg is built in the alternator, which is relatively new. Could it be a problem with the distributor?
  7. M

    Erratic tachomether

    The rpm do not change and it is the only instrument acting up. The cable are silicon sleeves and tinned. Changed them a couple of years ago they visually look good. The boat is on a fresh water lake so not that much corrosion happening in general.
  8. M

    Erratic tachomether

    Done that, no luck
  9. M

    Erratic tachomether

    I have already cleaned all the ground contacts I could find. No change
  10. M

    Erratic tachomether

    That’s the fuel gauge, the are no baffles in the tank so it jumps around a bit if there are waves. Everything else works as expected
  11. M

    Erratic tachomether

    My tachometer started being erratic, especially over 3k. It wildly swings, but the actual engine rpm stays constant. I cleaned all the ground contacts, but it did not help. The alternator is an Arco Marine with an internal regulator, and it is about 5 years old. The battery charges fine, and I...
  12. M

    Help with OMC 120

    Points are, condenser we reverted to the old one to try to see if it made a difference. I also reverted to the old cap and rotor and it seems to be working for now. Maybe the new one was defective 🤷‍♂️. Will do kre testing tomorrow
  13. M

    Help with OMC 120

    It does! Is the fuel pump the same for the 120 and the 140? I put the pump of my 140 since it was much newer. Today it run for 15 min…
  14. M

    Help with OMC 120

    It runs for 30 minutes every time; if there was something stuck in the carb, it would constantly run badly. I didn't have time to see how long it needed to sit before it ran again. But every day I go to the boat, try something new, do a test run, where for about 30 min it runs fine, and then I...
  15. M

    Help with OMC 120

    We cleaned it and rebuilt it with new gaskets, float, needle, and accelerator pump
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