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    1981 120 mercruiser broken rocker arm

    Hello all, Been hitting it hard this summer trying to get out as much as i can but ran into some trouble the other day. Was cruising at about 3800RPM when all of the sudden the engine started to backfire terribly. Came to a stop and started to poke around when i removed the vale cover i noticed...
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    1981 120 Mercruiser idles rough when hot

    Success at last. When i felt how hot the coil was i ran to the autoparts to get a new "stock" coil, reconnected the ballast resistor, and it ran good for over 20 minuets! Like they say shes fixed for now we will see what happens when i put it in the water this weekend. Thanks for all the help
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    1981 120 Mercruiser idles rough when hot

    When it starts to stuble timing is irradic jumping all over
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    1981 120 Mercruiser idles rough when hot

    Okay so update all. i got a fuel pressure test kit but it did not have the right fittings so i could not test that. I have very low suspicion that is the issue anyways. Compression cylinder 1 130 cylinder 2 105 cylinder 3 140 cylinder 4 130 Removed the distributor cap and shaft has little to no...
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    1981 120 Mercruiser idles rough when hot

    runs at 140 not too hot just saying after a long hard run starts acting up
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    1981 120 Mercruiser idles rough when hot

    Okay ill check that. No it ran fine when i first out the electronic ignition in this is a new issue that seems to be getting worse.
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    1981 120 Mercruiser idles rough when hot

    The timing jumps around at idle when i put a timing light on it. Suppose to be set at 8 and jumps irradically from 7-9 BTC. Do you think thats my issue and how do i fix it?
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    1981 120 Mercruiser idles rough when hot

    All the way carb is good and cleaned new gaskets and all
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    1981 120 Mercruiser idles rough when hot

    Fuel tank is good and clean. just rebuilt and cleaned the carb
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    1981 120 Mercruiser idles rough when hot

    what should the pressure be? No flooding cant see and fuel squirting into carb at idle
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    1981 120 Mercruiser idles rough when hot

    Hello all! I cant seem to figure this out for the life of me. I have a 1981 120 mercruiser that has been in the family for the last 20 years. I love this boat maybe a little too much lol in the last five years we have been through it. I redid the interior and basically every engine component...
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