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    1970 15' Mirrocraft w/ Merc 50HP. Help me find my starting point for a proper prop.

    OK so I'm pretty new to boating. I have a 1970 Mirrocraft Titan 15 foot with a Mercury 500 Thunderbolt 50HP. I have an SE Sports whale-tail which gives me mixed results. If I don't run it, my prop vents a LOT and slips in the water. If I run it, it runs better but I think it slows the boat down...
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    1970 Merc 500 Thunderbolt 50HP, Can someone help me find a water pump and seals?

    I have a 1970 Merc 500 Thunderbolt 50HP motor. I bought the boat like two years ago and it's running strong but I've never done the water pump. The previous owner claimed it was done the years before he sold it to me and I've only taken it out like a dozen times so I'd not bothered yet and just...
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    1970 Mirrocraft Titan 15, no stringers? Foam for structual support?

    I bought a 1970 Mirrocraft Titan 15 as a restore project a couple years ago. Transom has been replaced. New deck, new seats etc. When I had the old desk out I found the whole hull was pumped full of foam and it was all wet. Everyone suggested I pull and said it would make the boat faster...
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    1970 Mirrocraft w/ Merc 500 loss of power, prop seems to push air, lack of water?

    I have a 1970 Mirrocraft Titan 15 with a 1970 Merc 500 50HP. Sometimes I just loose power when going. This isn't an engine issue, engine runs great. Seems to be like, um, the best way to describe it would be to say I'm running out of water around the prop. The RPM's come up and its like I'm...
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    1970 Merc 500 Thunderbolt 50HP, Need to replace fuel lines and add a Tach. Options?

    So I took my boat out for the first time this year 4th of July to watch fireworks from Gun Lake here in Michigan. When I primed my engine I had raw fuel dumping out of the motor so I popped the covers and discovered that I was getting fuel spraying out of the fuel line that connects the two...
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    Merc 500 Thunderbolt on a 15 foot Mirrocraft. What pitch prop?

    I have a 1970's Mirrocraft Titan 15. You can see the boat specs on the attached photo. Weight, length etc. Boat has a 1970 Merc 500 Thunderbolt 50HP. How would I go about selecting the pitch that would be best suited for this boat? When I bought the boat it has a Michigan Wheel 10 1/4 x 13...
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    1970's Merc 500, Questions about Stator performance or lack of...

    I have a 1970's Merc 500. Engine is running pretty good right now but I'm about to rebuild the carbs and I've repaired some wires that look less then um, safe! I have a question about the stator. So if this part is working properly, should the battery loose power as the engine runs? Is there...
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    1970 Merc 500 - Need help identifying what prop I have please!?

    Bent the prop on my 1970 Merc 500. I believe the motor to be the original that came on my 1970 Mirrocraft Ski-N-Troll so I assume the prop is matched to the boat setup? The prop is very worn too and I can barely make out the lettering but I believe it says: 10 1/4 x 1 Can someone tell me if...
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    1970 Mercury 500 50HP - Bent prop, get another factory OEM or...?

    Damn it all to heck! I bent the prop on my 1970 Merc 500! I was on a river trip and hit something. The water didn't seem too shallow but I think there was a rock or something hard sticking up and I heard it hit and whack several times. I took a small chunk out of the edge of one of the blades...
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    Running a Hyfrofoil on an older 1970's Merc. To drill or not to drill?

    Just wanted a quick opinion. I had a bit of weight in the back of my boat and yes I realize I can move my fuel tank and batteries to the front but my friends all swear by the SE 300 and SE 400 Sport Hydrofoils. I prefer the no drill option simply for not drilling but I have one mounted right...
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    1970 Merc 500 lower unit takes on water. Need advice on where to start.

    Mind you that it's not MUCH water at all but I've noticed that when I come back in from the lake my lower unit gear case has milky white-ish colored gear fluid in it. I always drain it right away and let it drip for a couple hours then fill it right back up til it over flows to push any water...
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    1970 Merc 500 - Adding fuel / water separator, does this replace inline fuel filter?

    I have a 1970 Merc 500 I've recently had a lot of trouble with due to carbs, water, life etc. I got it running again and I'm thinking about adding a fuel / water separator to the fuel line. I currently have an inline OEM Mercury fuel filter so I'm wondering does the fuel / water separator...
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    Question about old Merc metal fuel tanks. Engine won't get gas.

    So I've been having various engine troubles the past couple days.I just realized I'm not actually getting fuel to the engine via the bulb now. I can pump and pump the bulb and it never gets hard. Brand new factory OEM Quicksilver/Merc bulb. Brand new lines. The only thing I reused were the...
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    1970 Merc 500 50HP Thunderbolt now stalls when I give it throttle. Carb issues?

    First off excuse my grammar, I'm sending this from Google Chrome on my iPad on my lunch break! I just picked up an old 1970 Merc 500 Thunderbolt with electronic ignition. It started right up when I got it, ran OK with only minor hesitation that passed as soon as you opened up the throttle. In...
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    Merc 500 50HP Thunderbolt. Wiring overhaul and timing belt question.

    Actually I just edited this thread. I have a timing belt question too. How loose should the belt be? I can grab a hold of it and it's got a bit of back and forth flex. Are boat motors considered interference engines? What happens if the belt breaks? I will post a video of how much play it has...
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    Merc 500 Thunderbolt, Merc Control throttle cable adjustment questions.

    I have an old 1970 Merc 500 on a Mirrocraft Ski-N-Troll and I recently replaced my transom. Obviously I had the motor off and unfortunately, I didn't pay much attention to where exactly the adjustment screw thingies went. What I mean is on the motor end, the thread shafts on the cables screw...
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    Steering unit rebuild?

    If this is the wrong section, I'm sorry! Is there such a thing as rebuilding or tightening up a steering gear box? The steering wheel is awful loose. The actual wheel isn't loose but the steering gear box is. I can move the wheel a couple inches each direction before the cable starts to move...
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    Need some suggestions for some transom replacement issues.

    Couple issues with my recent transom install. Nothing major but I would love some feedback and suggestions. Pictures are below the questions! 1. I need some suggestions for filling a gap between the edges for splash-well and transom. The metal plate never touched the transom, it was filled...
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    A questions about alumium cleaning and prep before installing a new transom?

    So what do I need to do to clean the aluminum skin on my boat before I install a new transom? I've got some brown crap and some light corrosion and pitting. The wood was factory and not P/T, I've just got some age and water damage going on. The wood was like powder in some area's! Do I need to...
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    What type of wood for a 2x4 transom support brace?

    I'm redoing my transom on m 1970 Mirrocraft Ski-N-Troll and one of the support is a 2x4 plank. The actual transom is 2 sheets of stacked 3/4 inch which I'm going to use Roseburg 3/4 Marine Plywood coated with West System for that. The 2x4 support wouldn't work out of Plywood due to the way the...
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