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    1978 Mercury M-800 starting issues

    Mercury starters are usually held in place by rubber mounts. They therefore need a good ground cable to the block. You might check yours for corrosion.
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    Stringer rotten

    Gee, there is no way to tell IMO. Can you reach everything you need to grind out to fix the stringer? If so, the cap can stay on. Unfortunately, a rotten stringer is usually the indicator of other rotten structural components. If you keep the cap on, and the transom need replacement, it...
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    Help Buying Boat

    Those boats and motors are pretty old. Experienced guys can check the compression and gearcase, plus the overall condition of the hull. Generally if the motor has good compression and the gearcase is good, the rest can be fixed for reasonable money, if they do the work themselves. If you...
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    Shifter on 97 Crestliner with a 97 90hp Johnson

    It is a real simple system. Make sure the throttle is in neutral. Push and hold the button, and move the throttle forward. You may need to move it 45* (say to 3 o'clock position) before the throttle advances.
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    Please help.Motor keeps locking???

    Whereas seizure of the engine can be caused by overheat, it can also be caused by a lean air fuel mixture (dirty carb) or low or missing oil in the fuel. Do you mix the oil with the gasoline or does it have oil injection? If the latter, you should suspect it is not working properly. It...
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    Won't acccelerate

    The motor is a 2 cycle XR6, likely from 2001 or older. I doubt it is under warranty.
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    Won't acccelerate

    A lot of Mercs tend to stumble upon acceleration, if the carbs are set too lean, as most do not have accelerator pumps on the carbs. That is about as simple as it gets. You should have 6 mixture screws.
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    Mercury 135 not running

    You must be sure the carbs are clean and the timing is correct. Make sure you use the correct prop and the thermostats and poppit are working properly.
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    Start/turn over 2014 mercury 4 cycle 60 hp from the back of the boat

    Sure, put a momentary switch on the starter solenoid primary winding.
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    mercury blackmax 150 power/wot problems

    Duke is correct, and I mislead. Once you set the idle pickup timing and max spark advance, you push the throttle closed, which retards the timing, until you achieve the correct idle speed. Then set the idle stop screw to that point, and then adjust the throttle cable to push the throttle...
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    Lift 1970's 150 Mercury with no power!?

    Once the release valve is loosened, the motor will be able to be tilted up and down. If the motor is tilted up under power, the release valve will not let it down. However, you can always loosen one of the down hydraulic hoses and the oil will spray out as the motor tilts down under it's weight.
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    Just aquired a boat from a family member and the motor wont tilt manually either

    Your motor looks to have about 1/3 of the parts you need for power trim. You are missing the pump/reservoir that mounts in the boat and the 4 hydraulic hoses that power the trim cylinders, and of course, the bolts. The manual trim version of that motor needed to be in forward as Racer stated...
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    Mercruiser 4.3 Prop Question

    I think the 50MPH claim is marketing. My 18 foot SeaRay with a 4 bbl 4.3LX would get 42MPH, with a 21P prop. You will need to trim is to max, to achieve max speed.
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    Won't acccelerate

    Richen the carb idle mixture 1/8 turn and see if the hole shot improves.
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    mercury blackmax 150 power/wot problems

    Idle speed is controlled by the carb opening. The throttle cable controls that. So set it to push the cab closed and add a bit of preload.
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    Bone headed move - put the plug in with 3M 4200

    Lou, you can buy the Wallyworld "Marine Boat trailer and equipment grease". It has a cool blue color.....It works pretty good as well.
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    Mercury 115 inline 6 bearing carrier seal issue

    Did you look on the crowleymarine web site? They should list the part number of the seals, and whether they are the same.
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    mercury blackmax 150 power/wot problems

    Seloc often makes large errors in their service info. Idle pickup timing should be 0-9*ATDC and max spark advance s/b 21*BTDC. Hopefully the timing procedure is correct.
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    Bone headed move - put the plug in with 3M 4200

    Gee, I have had my garboard plug freeze in the fitting in saltwater. I needed a pipe wrench and hammer to get it out. There was not a lot of the plug left after that. I use some antiseize or grease on it now.
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    Mercruiser 5.0 Thunderbolt 5 ignition

    OK, rev it up to 2999 RPMs in neutral and see what happens. Just sarcasm. Don't rev an engine past 1500RPM in neutral. It is bad policy.
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