Recent content by muskyjim

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    Charging?

    The reading from fish locator/GPS says my 1979 70hp Johnson is only putting out about 12.3 volts when running wide open. My gauges on this boat are pretty old so I'm relying on what my locator is reading. I just put a brand new starting battery on board when I was getting these readings. Is...
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    Bunk versus Roller trailer

    Which is the better trailer, Bunk style or Roller. I currently have an old bunk trailer. I have an opportunity to buy an old roller trailer that needs a little work. Probably lights and bearings. My old bunk trailer has served me well but I've always been afraid it was a little under-sized. I'm...
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    Stops dead

    I have a 55lb. thrust MK Powerdrive. I was using the motor to pull the boat from one side of a very small lake to the other. I was running the motor at it's highest setting. The motor would lose all power. The power gauge on the trolling motor would show no power. After about 1-2 minutes it...
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    Replacement Battery

    What size marine maintainence free battery is best for powering a 1979 70hp Johnny? 24,27,29? How important are CCA's? I bought a hydrometer and every cell tested in the recharge range, and I had just taken the battery off of the charger. As I stated in earlier threads, this battery load tested...
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    Repairs and test results

    I finally made the repairs and upgrades that I have been asking all the questions about. First off: My OB is a 1979 70hp Johnson, 6 amp unregulated system. I installed a new rectifier, a tachometer, new plugs and tested cylinder compression in all 3 cylinders. The results: the motor idles at...
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    My voltage says 17 as well

    I posted this earlier, and it seems that I'm getting conflicting answers. I have a 1979 70hp Johnson. My voltage while running is charging at 17 volts while running. I'm changing the rectifier. That seems to be the common suggestion from this forum and my Clymers manual. My battery is a 3 year...
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    Tachometer

    I have 16 foot 1969 StarCraft with a 1979 70hp Johnson. I have a speedometer and a voltage guage for instrumentation. It all looks like the original configuration on the boat. Can anyone tell me if I should install a Tach and why I would need it. Thanks.
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    Drain plug

    Is it safe to put your drain plug in from the outside of the boat? It would sure be easier than installing it from the bilge area.
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    Prop condition

    I fish flowages a lot. I have damaged more props than I care to admit. Currently I have a 17 degree pitch prop that has some dings and gouges in it. I have had it repaired to the it max. Speed on those flowages is slow if you want to keep your prop and lower unit in tact and good shape. The...
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    Transom condition

    How does one check to see if the transom is in good shape? After reading a few threads related to this topic, I don't want to find out my transom was bad when my engine drops off the back of the boat and takes part of the boat with it. I have 1969 Starcraft Sportabout with a 1979 70hp Johnson...
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    Batteries

    Do deep cycle batteries have a memory? If I don't run it down completely and keep recharging it, will it die an early death? Do things like automatic bilge pumps constantly draw power from a battery? I'm asking all of these questions because based on this forum it seems that running my...
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    Bilge pump size

    I considering replacing my old bilge pump with a new one. I'm not sure of the age of the one that was in the boat when I bought it. It still works. Should I even consider replacing it? If I do, how do you judge what size to use? Are the automatic pumps better than manual pumps? My boat is a mid...
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    Over charging?

    I apologize for asking this question again. I used the wrong forum the first time. I have a 1979 70hp Johnson Sea Horse. At Idle it is charging around 14. The faster I go the charge creeps to as high as 17.5. This is double verified by the voltage gage on the console and my depth finder. I'm...
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    Tough to start

    1979, 70hp Johnson Sea Horse. This motor has most always started hard. Even when the plugs are new. After running up the flowage and it's all warmed up, after sitting from 10 minutes to an hour, I still have to use cold starting procedures to get going. Is this typical with an older motor?
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    Slick

    1979 70hp Johnson Sea Horse. When the motor is trimmed all the way up I am leaving a petro. slick behind the boat as I drift along. I fish a lot of flowages so I have to have the motor up when I'm trolling. I don't like to bounce the motor off of rocks, stumps, and other lower unit killers. I...
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