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  1. S

    mercury 1988 3 cyl 70 hp

    Hi Guys, Hope you guys have some input for me, if so thanks. The problem I'm having is, when on the water, the boat will do 3500 rpm. On occasion when I throttle down to a low speed, the rpm drops, but, when I throttle up it wont go past 1300 rpm. Then, If I throttle up and down a few times...
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    Mercury 650 3 cylinder rpm problem

    Hi I have a 650 merc 3 cylinder, not sure what year it is, how can I find out? Here is my problem In the water when I start it, it's running, at full throttle it was at 2000 rpm for like 5 minutes and wasent going full speed Then it like kicked in and went up to 5000 rpm And full power. Also...
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    1984 OMC shift problem

    Hi Guys, I got my boat out and working in the water yesterday. Well was working, lol, for the first hour. was working fine, top speed 35 miles, (120hp), not bad. Then I got this problem, when I stopped for a few mins, then tried to go in to gear, nothing happened. I couldn't go forward, but able...
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    trim gauge

    My trim gauge doesent work, I just got the boat, where do I start? anyone have a wiring diagram of how it should be wired boat is 1984 120 hp Johnson omc inboard outboard please help
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    horn question?

    Hi, is it possible for the horn to work off of 9v volt battery? as a test, even though its 12v volts
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    STRINGER TRIM DOES NOT WORK PROPERLY

    Hi, I just got my first boat 1984 120hp Johnson omc I/O. I don't know much about boats or engines. my issue is, on the throttle handle the up and down trim buttons, when I push the down button I hear like a motor running sound. but nothing moves. when I push the up button I hear a click noise...
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