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  1. K

    1973 Mercury 1150 Misfire on cylinder 3 and 6

    Ran like a dream. Came home and started winterizing. Lower unit had a bad shift-shaft seal, but I had one on hand. Waiting on impeller kit to put it back together. Impeller was still fine but the housing should have been replaced last rebuild (had melted plastic at the top) and gasket tore...
  2. K

    1973 Mercury 1150 Misfire on cylinder 3 and 6

    I'm going to take it out in the morning to give it a try on the lake. I had good idle and decent operation up to 2,500 RPMs the other day and then it would fall flat. This better be it because It's high in the low 60's after tomorrow and I'm ready to winterize, but not until it's running right...
  3. K

    1973 Mercury 1150 Misfire on cylinder 3 and 6

    I did a bunch of trouble shooting this morning. Started off by pulling the plugs on those cylinders and they were dirty cleaned them up and that had no effect. Pulled the distributor cap and all the wires and tested from the plug end all the way to the contact points on the inside of the cap and...
  4. K

    1973 Mercury 1150 Misfire on cylinder 3 and 6

    Plug photo. 1-6 Left to Right. 2 and 4 are a little clean, but 3 and 6 look normal. Random flashing on 3 and 6. Sometimes one or two flashes a second then none for a second or two, then a random flash here and there, vs constant strobing on all others. I'll pull those plugs and give them a...
  5. K

    1973 Mercury 1150 Misfire on cylinder 3 and 6

    New: trigger, plugs, wires, harness, key switch, rectifier (non-standard with voltage regulator). I used a timing light and tracked down poor performance issues to intermittent spark on cylinders 3 and 6 only, 1,2,4,5 are all firing away. swapped plug wires and problem stays on 3 and 6...
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