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  1. H

    1977 Thunderbolt 500, throttle cable slipping off while on the water

    I switched cables last year and twice since the throttle cable has come off while under power. The pin that has the roll pin through it, slips out of the black barrel adjuster. Am I missing a keeper or something:
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    Your thoughts on a throttle control issue with late 70's MerControl

    My 78ish MerControl goes into FWD-N-REV perfectly and the fast idle lever works fine. When I shift to FWD or REV their is a dead zone for about 1/2 to 3/4 of the stroke of the lever before the carbs are pulled open. I know that there is a cam inside the MerControl that rotates and in turn pulls...
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    Juat added side bunks and they are causing the trailer frame is deflect, anyone dealt with this?

    I have a Tee Nee trailer for my 16' Sylvan, it has always been a pain to get loaded, especially if it is windy or wavy. I recently added a set of Overton side bunks and they seem to be a decent product. Unfortunately, the bunks make the trailer frame deflect. I haven't launched since I installed...
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    '84 merc 40hp, kicks up when in reverse

    When the motor goes in reverse, there is a lock rod that originates in the lower unit that should rise up and turn 2 C shaped clamps on your engine mount. Those clamps grab on a bar that is adjustable in the motor mount, it also determines the angle of the motor on the boat. If your motor is...
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    Carb needles keep sticking closed, wondering why?

    Three times now I had a carb needle stick in the UP (closed) position, and not all on the same carb. These are the rubber coated needles. Each time I took the carb off and the bowl as dry, I remove the float and have to grab the needle/spring with needle nose pliers to free it. I have cleaned...
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    Is there anything that can cause an ignition coil to burn out or does it just happen?

    My Merc 500 has 3 original coils and one that had been replaced, recently that same newer coil failed again. To my knowlege, this is just one of those things that can happen and I can think of almost nothing that would cause it. The coil failed with a hole burnt in the side where it arced out of...
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    Successful maden voyage, minor csrb/ignition issues, Merc questions...

    For those of you who have not been helping me with this already... '78 Sylvan Sea Master with a '77 Merc 500 50hp 4 cylinder, just launched after 13 years and the boat was recently rebuilt. I had a little bit of a rough idle in the driveway, but when I launched it, it cleared up after about 3...
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    What does a man have to do to get a Tillotson fuel pump inlet to quit leaking?

    I had no leaks, I pulled the carbs to clean them and I had a hard time getting the plastic inlet piece off of the carb, it was stuck. Once I reassembled them, I literally had to reassemble the inlet piece 15 times to get it to stop leaking. I bought a rebuild kit with all new gaskets after that...
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    Need to service my starter, anyone experienced?

    My '77 Merc 500 starter gear has seen better days, it also occasionally sounds like the bearings could stand a little grease. From time to time it seems not to stay engaged as long as it should, I cleaned and lubed the shaft which helped somewhat. I'm usually not afraid of starters, I have...
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    '77 Merc Thunderbolt not idling... now what? I have changed/fixed a few things.

    OK, last year this motor started right up and ran well in the driveway. It started right away and ran smooth. Since that time I had removed the lower unit, and long story short, I took it to a Marine repair place. He reinstalled the lower unit and changed the plugs, but he asked "has this motor...
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    Bad plug wire, buy a premade set, buy a kit, solid, or spiral?

    '77 Merc 500 Thunderbolt has 1 bad wire. Isw solid lawn mower plug wire the same? Can I use automotive spiral? Do I buy a kit? Do I buy them pre-made?
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    Mercury 500 reverse lockout rod install, frustrated as all heck!

    I have a '77 Merc Thunderbolt 500, I installed a new lower unit last year only to find out that the reverse lockout rod was missing. This is a long shaft engine with that little 5" or so extender between the shaft housing and the lower unit, s/n #4803973. I purchased a new-old stock reverse...
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