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    90 Merc 20hp, same problem as last year.. runs on one cylinder only

    Hi everyone, another year another string of posts from me. So Im still having issues like I did last fall. My 20 hp merc will only run on one cylinder when first started. If I keep running it on one, when it gets hot it starts to make the dead cylinder sputter and then it leaps up to speed on...
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    Is water supposed to come out of the hole where the impellerrod enters the lower

    Water tested my 89 20HP motor with the muffs on. Got water from the top end, out the little hole on the side of the lower end, but also from the hole where the impeller rod runs from the top to the bottom end. running out of there pretty good. Is this because of the pressure of the water being...
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    appreciate someones help. 89 20hp merc int. runs on one Cyl

    1989ish 20 hp merc. It starts when I launch it, but it only runs on the top cylinder. Very slow. If I take the top cylinder plug wire off, it wont start on the bottom cylinder. <br />If I run it on one cyl for 10 minutes or so, the other cylinder seems to pop once or twice for a second, then all...
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    why does my 20 hp merc run on only one cylinder?

    1989ish 20 hp merc. It starts when I launch it, but it only runs on the top cylinder. Very slow. If I take the top cylinder plug wire off, it wont start on that cylinder. <br />If I run it on one cyl for 10 minutes or so, the other cylinder seems to pop once or twice for a second, then all of a...
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    20 hp merc runs on one cylinder until it gets hot. Anyone know why?

    1989ish 20 hp merc. It starts when I launch it, but it only runs on the top cylinder. Very slow. If I take the top cylinder plug wire off, it wont start on that cylinder. <br />If I run it on one cyl for 10 minutes or so, the other cylinder seems to pop once or twice for a second, then all of a...
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    Lean mixture screw Merc 20HP- where is it? Is that the screw on frt above air th

    I think this is the lean Mixture screw, but Id really like to be sure. I have a lean sneezing condition I need to take care of. I must also say THAT I ABSOLUTELY LOVE THIS FORUM. I only hope that I can contribute to it as much as I draw from it. Thank you to everyone during the last couple of days!!
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    Fixed the flooding, now it's backfiring. Why?

    90 Merc 20HP tiller. As explained earlier, I had a carb problem that caused the system to overfuel. Seems the carb was clogged up a bit. Blew it out and rebuilt it and now it's running. However, at idle, there is a popping from time to time, kind of backfiring. When I rev it up, the popping...
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    20 hp merc flooding despite efforts to rebuild

    Help. PLEASE. 90 20hp merc, starts and runs, but floods out and starts to bog down. I take off the fuel line and it runs fine. Put it back on and it floods again. When I squeeze the primer bulb, fuel runs out the top of the carb. Ive changed the fuel line, float, needle, diaphragm, blown it out...
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