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  1. R

    70hp running weak - suddenly

    My 1980 J70ELCSA started running at about 30% across the power band today, after running strong all summer. All afternoon today I tried all the regular stuff - disassembled and reassembled fuel pump - no change. Swapped with another fuel pump - no change. Tried different gas tank - no change...
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    replacing timer base - specific procedures?

    I am replacing a timer base and stator on a 1980 70hp 3-cyl. Removing the parts was no problem for me. Are there any specific instructions for installing the new parts, other than reverse-order of removal? Thanks RB
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    marks on flywheel magnets

    On my flywheel there are some dark marks about an inch long. Look like someone marked the magnet with a dark-brown sharpie. The marks won't wipe off. I'm replacing 30-year-old stator and timer base. Stator has large crack in outer housing. I figure that may be what caused the black marks...
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    Replacing stator and timer base

    1980 70 hp J70ELCSA. If I replace the stator and timer base, can you tell me the procedure for getting the synchronizing / timing correct? Do I need special tools?
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    Carburetor Questions

    Motor: 1980 70hp 3 cyl J70ELCSA Question 1 - When the engine is running, unburned gas pours steadily out of the center carb. Is this a problem with the float, needle, and seat? Question 2 - Does a carb repair kit have the necessary parts to fix this problem? Thanks Richard
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    1979 shop manual for a 1980 motor?

    In searching for a shop manual for my 1980 70 hp Johnson, the closest I found on iboats was a 1979 manual. Would that work just as well, or, did they make enough changes to matter in 1980? Richard
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    Does Sta-bil cause extra smoke?

    Added Sta-bil marine formula to gas tank couple of weeks ago, without running the motor. Next time running the motor, it smoked a lot more than usual. Blue/white smoke. I ran the motor for quite a while. Ran fine, but continued to smoke more than usual. Does the Sta-bil cause that?
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    Help with replacing oil seals on propeller shaft - ?

    My motor is 1980 70HP. I find oil in the propeller, the oil looks milky when I drain the lower unit, and I see a lot of oil blown into the water when running the motor. So I'm thinking I should replace the oil seals and O ring in the bearing housing on the propeller shaft. The manual I have...
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    Lower unit oil flush?

    I have a 1971 50hp with electric shift which still works well. I have used standard-fare 80w90 marine gear lube in it for 9 years or more. I just found out that Johnson makes a special oil for those electric shift motors, so I plan to change it out. Question: should I just change the oil...
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    Changed Powerpack - ran well

    A couple of weeks ago I posted several questions about my 1980 70hp starting and running well, then after a few minutes, bogging down and stopping. This forum led me to test the spark on each cylinder. I did that and found #3 cylinder not firing. The forum then led me to replace the...
  11. R

    CDI, Sierra, Mallory, OEM? What is the best choice?

    1980 70hp Johnson 3 cyl. I'm getting ready to buy a power pack and 3 ignition coils. I've found four options for brands. CDI, Sierra, Mallory, or the actual Johnson-brand parts. While I know this may start an unending debate, I'm curious if there is a consensus about the quality of the...
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    final advice on power pack exchange?

    Thanks to this forum I'm moving ahead. Expert, humor me if you will.... Here are the facts: 1980 Johnson 70hp 3 cyl. Starts easily, runs well for 10-15 mins, then bogs down and finally quits No spark on #3 cyl after motor misbehaved. Spark good on 1 & 2. Swapped coil wires #3 with #2...
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    How do you test coils?

    What are the symptoms of a coil, or coils, going bad? How do you test coils to see if they are faulty? Richard
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    Power pack testing

    What are the symptoms of a failing power pack? How do you test a power pack to see if it is faulty?
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    Spark? Compression? Remote starter? Testing coils? Testing power pack?

    My engine starts well, warms up, boggs down, and finally dies and won't re-start. I'm suspecting electrical.... Would someone give me some quick tips about checking spark, checking compression, using a remote starter switch, and testing coils / powerpack? 1980 Johnson 70hp 3 cyl Spark: I...
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    What voltage if all is correct?

    1980 Johnson 70 hp 3 cyl. I'm trying to decide if my charging system is working. What voltage should I get if I have the motor at a little above idle and I put a voltmeter on the battery terminals? I've been told that is the way to check. Is that correct?
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    Checking the spark - procedure?

    1980 Evinrude 70 hp -- what is the easiest way to check the spark on a motor that has stopped running but will still crank? My motor starts and runs fine, but then after 10 minutes or so of running it boggs down and finally quits. It will still crank but won't run anymore until later. Folks...
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    Changing thermostat 1980 70 HP Evinrude

    Can you tell me how to change the thermostat in a 1980 70 HP Evinrude (3 cyl). Thanks!
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    Too much gear oil 70 hp evinrude?

    1980 70 hp Evinrude -- what happens if you fill the lower unit from the bottom, like you're supposed to, but you don't drain off an inch for expansion as indicated in the manual? I made this mistake and I to know if I need to get the boat back out of the water to drain off an inch of oil...
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    70 hp Evinrude stalling

    1980 Evinrude 70hp starts great, running fine in all respects, for 10 mins or so. Then it cuts to very low power, runs a while longer, and then finally stops and won't start again. Could this be a water problem? Themostat not opening, causing overheating? Pee hole discharge is strong. For a...
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