Recent content by mthwrt

  1. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    I replaced the carb. It took a lot of fildling with the idle and pilot screws but now it’s running really nicely even WOT. It now starts straight up without giving it throttle. Is it worth buying a vacuum garage to fine tune the fuel/air mixture if it’s running well now?
  2. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Today I replaced the spark plug wires and distributor cap. (the carburetor hasn't arrived yet) It turns out the old distributor cap had been loose. After the replacement I tested the wires with the ignition timing light again. Plugs 2, 3, and 4 were showing a continuous stream of lights. 1 was...
  3. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Also it turns out I can just buy a new carb cheap.Amazon Is there any reason not to do this instead?
  4. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Unfortunately the wires on 1 & 2 are too short to reach 3 & 4. I'll just get a set. How can I tell exactly what carb I have to ensure I get the right kit?
  5. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    I did some more work. I disconnect the tach. It was disconnect for all I did below. I checked all of the plugs they all look great. I made sure the plug wire order was correct. I took off the spark arrestor, the motor seemed a bit stronger without it, although this was at idle so who knows...
  6. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Ok, I ran the motor with an ignition timing light attached. It was very interesting thank you for the suggestion (if I number the cylinder with 1 nearest the belts drives and nearest the bow) Cylinder 1: intermittent flashing Cylinder 3: continuous stream of flashes with occasional missed flash...
  7. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Well there is no vacuum in the fuel tank so no easy fix. I'll disconnect the tach wire to rule that out but I don't understand how that fits the symptom of the issue starting when the engine is warm. Similarly with ignition problems, what would cause them to only manifest when the engine is warm?
  8. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Why do I need to disconnect the tach wire? It's a good warning things are going downhill. Thanks after I try the vent plug idea. I'll see what's involved in a TKS carb rebuild.
  9. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Just to check what you are suggesting. I take off the big round filter and push the throttle level back and forth to see if fuel goes into the bowl?
  10. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    I like it. It fits the issues and it's very simple to try the fuel cap.
  11. M

    Perfectly for 15 minutes then, surging, knocking, and jumping tac

    Sorry if this has been answered but I can't find it. I have a 2001 Mercuriser 3.0 with a carburetor. I bought it a couple of months ago. Every time I take it out it does the same thing. I have to give it some throttle to start it. It runs great for 15 minutes of cruising. Then after 15 minutes...
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