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    mercury 4 stroke missing above 4000 rpm

    I have a 2002 90 hp 4 stroke mercury that has developed a hard miss above 4000 rpm. The motor is on a 20 foot Fisher pontoon I just bought from a dealer. the dealers mechanic said he compression was good and he had done all the maintenance and ran the motor for 45 min. What are the usual issues...
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    Tilt/trim stuck in full up

    My 150 Mariner Mag III is stuck in the full up position after torential rain. Will not respond from any of the T/T switches. Battery power is good. How do I get the foot back in the water so I can get the boat to the launch and on the trailer?
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    Mariner 150 mag III smoking excessively

    I have just bought a 1994 ProCraft 18' bass boat with a Mariner 150 Mag III. The oil injection has been removed sometime in the past. I have been mixing Quicksilver TWC-3 at 50:1 and the motor smokes really bad on start up and cold idle. I doubt if the motor has ever been de-carboned, which I...
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    Speedometer?

    I have an 1988 90hp mercury. There is a small plastic tube running from a fitting on the forward side of a collar near the top of the lower unit. The tube runs to the speedometer on the dash. This has got to be what causes the speedometer to register. The engine end of the tube doesn't appear to...
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    Leaking Rivets

    I have a 1990 17' Alumacraft Super Bandit with 90 hp Merc. Love the boat, but I have a problem with leaking rivets in the hull. I have a automatic bilge that pumps out about 2 gal of water every 30-45 min. The boat has an interior floor, so I can't access the "DRY" side of the rivets for repair...
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