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    Boat cover waterproofing

    Ideally you want some UV protection as well as waterproofing. I am not sure the 303 gives that. If not, I would use some generic scotchguard product, as the price is much lower.
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    Troublesome motor??

    I did not think Johnson made 4 cycle OBs in that year. They did make very good 2 cycle motors with good oil injection and multiple carbs.
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    Engine Won't Run When Warm

    My 1998 Johnny 150HPV6 (6 carbs) does that whenever you run it for a while and turn it off. It idles rough for a few minutes but will idle. I usually let it run for a few minutes at high idle and then she will clear out and run fine. I think it is a slight overheat issue. You might...
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    Repainting 1995 Crestliner Phantom But Leaving Bottom Bare

    You plan to trailer it, right?
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    Shifting problem

    MerCruisers usually have an upper and lower shift cable. The lower shift cable is a bit tricky to install as it needs to be threaded thru the shift cable bellows and the bitter end installed. A service manual is a good idea. The upper shift cable and throttle cables are more straight...
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    Lower unit compatibility

    https://www.sterndrive.cc/Mercury-Mariner-Force-Outboard-Lower-Unit.html
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    Lower unit compatibility

    It is probably best to retain your gear ratio and gearcase size. Merc driveshaft length are usually not adjustable. So you need to order the correct driveshaft length and ratio plus the size of the gearcase. On an unusual event, I had swapped a 1993 Merc V6 25" 5" extension for a 20"...
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    Lower unit compatibility

    Why not go on the SEI website and see what gearcase models fit your motor, as well as other models? It is likely that V6 gearcases from the late 70's to the early 2000s will fit, but you need to check. You will want to know your gear ratio. 2::1 is most common, but there are others as well...
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    Trim sender

    If the outdrive is a MerCruiser, replacing the trim sender is pretty easy. It should just be a couple of screws and a couple of wires to splice. Senders are simply variable resistors. MerCruiser is kind enough to place them where they get wet and rot out. I would inspect yours first...
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    Marine or Auto oil pan

    I had the same issue in my 4.3LX. The pan rusted thru, leaking all the oil into the bilge. I had the boat towed to the ramp and put it on the trailer. I then built a "old west-style" hanging scaffold. 2X4s for the legs and a double 2X8 for the beam. Remove the 2 bolts and 2 nuts, and d/c the...
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    Fuel Water Separator

    Gee, I do not like the look of either sample. Does the dark gas smell fresh? It looks to be quite old.
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    Ratcheting RG-45 crimpers or regular

    A lot of those cheap hand crimpers will tear the connector plastic. This allows moisture into the connection which limits their lifespan.
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    Voltage rectifier

    CDI electronics, Sierra and GLM make aftermarket parts that are pretty good. They are about 1/2 the price of OEM, and they still make some parts that are out of OEM production or at least the OEM version is in short supply.
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    Mercury 135 not running

    A lot of times the lift is not exactly straight up, or the motor is not parallel to the lifting. This causes the studs to bind in the midsection casting, along with any corrosion on the bolts. Leave some lifting pressure on the eye, and push on the crankcase next to the carbs with your hands...
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    Fuel Water Separator

    You might want to siphon several gallons of fuel from the bottom of the fuel tank, into a Jerry can. Let that sit a bit and then siphon the bottom of the Jerry can into a clear container and see if you can get all the water out at one time. Toss some 2 cycle oil into the fuel to color the...
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    Stringer rotten

    When I hurt my shoulder badly earlier this year, after about 2 weeks it stopped getting better on it's own. I went to a walk-in clinic and they proscribed one of those 6 day steroid packs. That provided much healing, and when I was able to get an appt with an orthopedist 2 weeks later, he...
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    2006 40hpELPTO 2 stroke, is some white smoke normal?

    Tubs are a bit safer than a flusher. Flushers can fall off or get a kink in the hose. You need to watch them closely to make sure they supply water whenever you are running the engine.
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    1991 mercury starting issue

    It does sound like corroded battery cables. They can corrode even under the insulation. Look for bulges in the cale along it entire length. Make sure the ground cables are good as well.
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    Mercury thunderbolt 500

    You can look up the year using the serial number on the maxrules site
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    Rust, generally how to clean and best spray to keep it from rusting?

    Galvanized paint needs to go on bare metal. It works best on metal already galvanized, but needing a touch up. If the trailer is painted, and sandblast is not available, sanding, priming and overcoating is the next best option.
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