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    Old Engine New Plastic "Baloon" Tank Problems

    I have been cracking the lid. That's not a good fix. Got to remember to crack it/tighten it when moving so it doesn’t spill. As far as the scuba regulator for the fuel line that's a stupid solution too. That solves the problem of the engine belching gas all over the place but still the tank...
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    Old Engine New Plastic "Baloon" Tank Problems

    Man I HATE plastic gas tanks! I got this old free boat and it has a '70's Mercury 70hp engine on it. I've posted a few times with various questions on fixing it. Maybe this ought to be in another forum since it's more tank related than Mercury related but I wasn't sure so sorry if so. Anyway...
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    70 HP Mercury 700 2 Stroke runs rough with cowl installed

    Well my best guess is that it's a bolt hole with the bolt missing. This is an old engine that's been monkeyed with a lot over the years so this is very possible. I saw the hole earlier and I thought it was a weep hole or something. But when I discovered it was shooting out exhaust gasses and...
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    70 HP Mercury 700 2 Stroke runs rough with cowl installed

    I think maybe I figured out the issue. There is a little hole in the bottom of the block just below the exhaust cover (cover on the opposite side of the engine from the ignition stuff). This hole has been dripping oil. We figured it was some sort of drain or something. We didn't think it was a...
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    70 HP Mercury 700 2 Stroke runs rough with cowl installed

    I have a 70hp (3 cyl, 2 stroke) Mercury 700, serial number 4830257. You guys helped me a bunch last year getting it running. Last year I got the timing set pretty well. Also last year I rebuilt the fuel pump and carbs. We've had it out a few times and it sometimes runs good and sometimes runs...
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    1978 Mercury 700 Spark Plug Wire Replacement

    Another question on my old 1978 3 cyl 70 Mercury Outboard While I have it apart I thought I would replace the spark plug wires. The work but are old and don't look so great. I figured the coil end would just pull out. I pulled and it does not seem to come out. I tried all three thinking maybe...
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    1978 Mercury 700 Won't Start After Much Updating

    Lurked some over time but first post. We got a "free" boat with a Mercury 700 outboard, Serial Number 4830257, 3 cyl, USA made in 1978 I think. My son and I have been enjoying the project of trying to restore the thing. I picked up a service manual on ebay so have been using that. The...
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