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Recent content by tim0629

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    86 johnson 40hp backfires, wont start

    Lesson learned. I do/did tape and mark all the bolts and wires and wires and take photos and video as I pull things apart for this reason exactly. Of course these two leads are the same length and almost identical in color so it just slipped by. Murphy strikes again. What i found to be very...
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    86 johnson 40hp backfires, wont start

    Im embarrassed to say but when I put the motor all back together I must have swapped the leads going in to the ignition coils (from the power pack). So there cylinders were sparking 180 degrees from when they should have been and just backfiring like crazy. Hours of dinking. $200 in parts and...
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    86 johnson 40hp backfires, wont start

    Hi EdChris Yes I did check for this as well. I also confirmed that my timing light on the primary cylinder that it is firing around 2 degrees ATDC at idle and 2 degrees BTDC at the start position, and that the flywheel TDC markings does correlate to the actual TDC position of the primary...
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    86 johnson 40hp backfires, wont start

    I will check the kill switch wiring, but doesn't the presence of spark negate this theory? I still see spark across a gap tester and my timing light is firing during testing. My understanding is that kill switch kills spark.
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    86 johnson 40hp backfires, wont start

    The original problem was loss of power under load yes. I BELIEVE the problem was deteriorated fuel lines going from the input to fuel pump and fuel pump to carbs. But I didn't realize this until after I went on a crusade cleaning carbs, reed valves spark plugs etc. You are the second mention of...
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    86 johnson 40hp backfires, wont start

    Both throttle plates do fully close, photo attached for reference but I also manually grabbed the throttle position arm to make sure the spring is fully returning the throttle plates. No apparent issue here. Regarding your comment about lean - i was thinking lean as well but the one thing that...
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    86 johnson 40hp backfires, wont start

    Thanks racerone, I found TDC on the primary cylinder by sticking a screwdriver into the cylinder and rotating the flywheel until the piston "peaks." The TDC marking on the flywheel matches the arrow at that same location - doesn't that imply that the flywheel hasn't slipped? I'm open to pulling...
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    86 johnson 40hp backfires, wont start

    Hi all, 1986 johnson 40hp 2 stroke outboard not starting, only occasional backfire. Previously had an issue of low power under load which sent me on a warpath cleaning and replacing parts. - New plugs. I've test rigged these to watch them fire nicely. - carbs soaked in chem dip and boiled in...
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    Low power under load

    I will go ahead and replace plugs and see what I can do check timing. Side question - pulling the thermostat and looking for temperature switch as a potential root cause... thinking if the engine is overheating perhaps it could affect performance? Anyways... despite the schematic showing a...
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    Low power under load

    I took the plug wires off and tested the arc jump across the terminal to ground. I'd say at 1/4" both were arcing consistently. 3/8" was stretching it and the top culinder terminal may have only arc'd 50% of the time
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    Low power under load

    Hello, I'm running out of ideas on this one. Hoping someone has some insight to share... 1986 evinrude 40hp 2stroke outboard I will leave the dock in the morning and give full throttle. The motor does as expected and gives me full rpm, full power... but for only about 30 seconds. After which...
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