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    Throttle issue 1974 Merc 500

    I purchased a new MercControl unit from ebay as part of my restoration. I used the best parts from it and my former unit. The throttle and shift cables are from the new unit. After hooking everything up, it is shifting in F-N-R perfectly, however, the throttle doesn't start to pickup until...
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    Pitot Question

    I just installed smart tabs last night 5" inboard from each side. Where would be the best place to install the speedo pitot . On the inside Where I have about 15" on either side of the centerline, or outboard of the smart tabs in the 5" cushion. I was thinking of mounting it just inside of...
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    Windshield Frame Opinions

    I'd really like to paint my Aluminum Windshield Frame. I'd like to get some opinions from folks who have tried this. This is a walk-thru so I want to paint it with something that won't rub off when it is opened time after time. 1. What type of paint should be used 2. Should I not paint it...
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    Fuel Pump Diaphragm

    '74 Merc 500 4cyl two carb setup. I am having the same issues as others with running the fuel lines dry. Pumping the bulb springs the motor back to life. I have rebuilt the carbs and the fuel pump. I'm thinking this is either a stuck float/needle or the fuel pump. When I first connected...
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    Brown Sludge

    1974 Merc 500 I have researched the brown sludge on this forum and responses seem split between un-combusted fuel/oil/water and gear oil/water. This motor has been dormant for 10 years. I have rebuilt the carbs, fuel pump, new fuel lines, wiring, and water pump & impeller. Note: I was...
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    Telltale Reroute

    1974 Merc 500. I'm only getting a trickle/dribble from the telltale. Water jacket is not heating up (on muffs or in a barrel). I have run weed-whacker cable up the tell tale as far as I can and no change. There is a brass plug in the rear water jacket cover and I assume this is an unused...
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    Bedding Compound for the Cap

    I'm getting ready to rivet the cap back down and was wondering what is the best bedding compound to seal the cap. I was thinking 4200, but is there anything more economical that will do just as good a job. (like anything about boats and boat repair is economical). FWIW, I am dealing with a...
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    Need opinions

    I am completely re-wiring a 1974 Ebbtide Lakemaster Tri-hull with a 1974 Merc 500. Below is my wiring plan. I am switching to a dual battery setup and moving the ignition switch from the control box to the dash as well as installing a push-to-choke ignition switch. Guru's please give it a...
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    Gasket Question

    When replacing the rear cylinder block gasket (for the water jacket), For my order, I received two gaskets. Do these gaskets get stacked or did I just get an extra?
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    Water around the Plugs

    After firing a 10 year dormant '74 Merc 500 I'm getting water collecting beneath the spark plugs that is pooling in the cylinder cover circles that surround the plugs. I'm guessing that the cylinder cover gasket is shot. Can this gasket be replaced without pulling the powerhead? My manual...
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    Water circulation

    This was part of a thread I have going on the Boat Resto forum, but my particular question fits better over here. It is in reference to a 1974 Merc500 (3823131). I have rebuilt the carbs, new plugs, water pump assembly, new internal harness, and fuel hoses...
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    Bilge area Tie Downs

    Since I am replacing the transom in my 74 Ebbtide Tri-Hull (Floor & Stringers are fine) I also need to replace the aft section of floor in the bilge area. I am installing new fuel tanks, battery boxes, and a new bilge pump and was wondering if anyone had done something different as far as...
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    Ebbtide Tri-Hull Restoration

    This is a freebie from my Father in Law. 1974 Ebbtide Lakemaster with a 74 Merc 500. Transom is shot but the floor and stringers are in great shape. Took 2 samples of the foam and it is as dry as a bone down to the keel. I was actually surprised that the floor wasn't a total loss as well...
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    Cowling Decals

    I'm looking to replace the Decals on the Cowling for my '74 Merc 500. I know that these decals are no longer available thru mercury. I am planning to either go to a decal shop or repaint the cowling. I was just wondering if anyone has tried either of these methods and how it turned out.
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    '74 Merc 500 shift shaft question

    I have a 74 Merc 500 (SN #8323131) that I am in the process of reviving after a 10 year hiatus. I dropped the lower unit (in forward) in order to replace the water pump. The prop shaft would engage the drive shaft in the proper direction and click in the other. After I removed the top cover...
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