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    headgasket ???

    Hello I have a 75 70hp Johnson I did a compression test just to see where it was at, motor runs well but wanted to test anyways anyways I have 110 on two cylinders and the bottom cylinder has 97 is this something I should worry about or run it? Or would a new headgasket help? Motor was new to me...
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    shift linkage on 75 70hp johnson

    Hey everyone wanted to put a new impelled in today room 6 bolts out of the lower unit left 2 in case it dropped, anyways I cant seem to find where to disconnect the shift linkage I sound under the carbs there is a verticle rod that pivots when u put it in gear that runs down to the lower unit...
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    adding a tell tell on 70 hp johnson

    Hey everyone I've done a lot of research on the forum about adding a peehole on my 75 70 HP Johnson, I found some people drilled into the top of the head into the water jacket and also another drilled into the block itself by the lifting hook what area is most effective for this mod.? I'm a...
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    adding a pee hole

    Hey guys i have a 1975 70 HP is like to add a per hole out the back of rhe motor or side my pisser shoots towards the transom of my boat and cant be seen in while sitting in the boat is there a thread or a how to on the forum? Or anyone have any tips/ tricks to add a new one
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    70 hp sea horse vs 70 hp loop charged

    What's the difference between the two motors?
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    prime bulb question

    Hey everyone I have a pretty simple question just gave my 1975 70 HP Johnson new plugs and fuel filter fuel lines and bulb, while priming my motor I noticed The fuel filter is only filling maybe half full at best,is this typical? Or should I pull my aluminum fuel cell apart and see if I have...
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    testing kill switch

    Hey Everyone I have a 70 HP Johnson 1975 year been losing spark to number one cylinder then regaining it . I have a timing light hooked up to it that's how I noticed it . haven't tried swaping coils yet I'm waiting for my manual to come first before I do that anyways I wanted to test my...
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    black yellow kill switch wire

    Hey guys I ordered an omc and a Johnson manual for my 70 HP Johnson its a 1975 won't be here for a week so I got a question, I have an ignition problem with my #1 cylinder it has great spark and about half throttle it intermittently loses spark then comes back its only on that cylinder can I...
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    75' johnson 70hp loses spark on a cylinder

    Hello I have a 75' 70hp Johnson loop charged motor took it on the lake had a mid range shudder it seemed so I cleaned the carbs and synced them agaon, tried again on the lake motor still shuddered then cleaned up when my boat started to plaine out . Took it to a mechanic he said my number 1...
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    my first boat, power tilt trim questions

    Hello everyone I'm new to the forum,I recently purchased my first boat its a 16' glastron bowrider with a 1975 70hp Johnson in it. It also has power tilt/...trim?? Here's my question I had the motor tilted upward in the water prop was about 12" under water wanted to spray a rooster tail ( just...
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