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  1. 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...
  2. M

    Help with OMC 120

    I just swapped my OMC 140 for a 120. I needed an engine ASAP and didn’t have the time or the money for a new engine, sterndrive, and transom, so I swapped in the engine. I’m now having issues with the “new” engine. After about 30 minutes of flowless running, it stutters and shuts off. It usually...
  3. M

    4 blade propeller on stringer 400

    Hi, I have a 5.5m boat with a 3.0L and a stringer 400, with a 3 bladed 13.5x15 prop. Last year I started taking tourist around the lakes for tours. Top speed is not my priority, fuel efficiency is. Will a 4 bladed prop help on that front? My understanding is that a 4 bladed prop will allow me...
  4. M

    Stringer 400 oil plugs washers

    So I’m changing the oil on my early 1970’s stinger 400 and I need some advices on the plugs washers. Right now the plugs have what I assume being nylon washers, is that the correct material? The oil was super milky in the mid section so I assume quite a bit of water got in, top and bottom were...
  5. M

    1979 3.0L OMC coil

    Hi, I need to replace the coil on my engine. The one currently installed is a random coil salvaged from a random engine. What is the correct coil? I believe I have a Delco cap. One more thing: I want to switch to electronic ignition is this the right kit...
  6. M

    Engine Swap 1979OMC with 3.0L Quicksilver

    I have an old wooden boat with a 1979 OMC 3.0L and an equally old OMC Stringer 400. In recent years, both the engine and the sterndrive have given me a ton of issues, and it is becoming exceedingly difficult and expensive to find replacement parts where I live (Italy). I'm usually able to find...
  7. M

    OMC 140 3.0l drive compatibility

    Hi, I have an old 1979 OMC 140 hp 3.0L on my boat; aside from the carburetor needing to be rebuilt the engine it's in ok shape. What it is not is the Stringer 400 drive that has been the bane of my existence. I live in Europe where parts are almost nonexistent forcing me to buy highly used parts...
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