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    SLOW Mode 150

    The sensor is supposed to reset when the motor has cooled. I would locate a sensor, but not order it yet. Replace thermostats and waterpump, with the whole kit. If she is still in S.L.O.W. mode, replace sensor. Your motor also has a shift assist switch that kills spark to 1/2 the motor. You...
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    nothing works

    Also, motors do not crank, if they are in gear.
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    1967 MFG Sprint. Steering cable Help

    I would have expected that boat to have come with cable/drum steering. Anyway, steering cables do not last forever. I doubt there is anything you can do to repair it, as they are crimped together, and well shielded from water. Once water gets in the cable it is over for it. I would be...
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    Different way to set max timing?

    Sounds like a good way to destroy your motor. Max spark advance can be set on land, just by cranking the motor with all but #1 spark plug removed, and the prop removed. Simply set throttle to max and crank motor in gear, by jumpering the starter solenoid. The timing pointer can be set...
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    Mercury 85hp runs fine on Muffs but Boggs down in Sea

    Yes, 1-1/2 turns open is the initial setting. They will need 1/2 - 3/4 turn more, but must be adjusted individually, under load, fresh 50::1 fuel mixture, in the water. You might check the timing as well. Set the throttle such that the carbs are ready to open, but still closed. Crank the...
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    Going from 8" to 12" wheels -fender clearance?

    I do not like the look of the front spring support. That is too close to the tire, and it is sharp, unlike the fender. If the fender rubs, it will wear but not puncture the tire. You can get new leaf springs pretty cheap. Get a pair of 23" springs, and new fenders or stretch/bend the...
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    temp beeper mercury 115 1991

    overheat alarm is one wire. It grounds when it detects overheat, and grounding completes circuit sounding buzzer. Not sure what beep is. Look on head for overheat sensor. Likely tan wire. Ground it with ign on and listen for buzzer. Most controls have buzzer built in. Some are mounted...
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    Mercury 85hp runs fine on Muffs but Boggs down in Sea

    It is not the seawater. It is not the cooling system. it is likely the idle mixture is too lean. The PO had some work done and the mechanic (or PO) didn't know how the set the carbs. The part about running well on the lake was BS. Take her out on a calm day. Warm her up and try to...
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    siphoning fuel from gas tank

    The best way to siphon the fuel is to remove the fuel gauge sender and put a piece of 1/2" copper pipe in the end of the siphon hose. Now stick the pipe thru the garboard drain and into a jerry can, and start the siphon.
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    2011 engine keeps beeping that it’s overheating!

    I could not find a 2011 115HP Merc, but the 2012 Merc 115 has a poppit on the side of the block. If would makes sense to inspect and repair it.
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    2011 engine keeps beeping that it’s overheating!

    What HP motor?
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    1973 Sea Ray 190 Fuel Tank Location

    A marine fuel tank will have a fuel fill opening(1-1/2"), a vent opening (~5/8") and a fuel withdrawal fitting (~3/8"), or two. It usually has a fuel level sender, and some sort of label or tag telling that is is a marine fuel tank and it's capacity. If your tank doesn't match that...
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    Thundercraft Inverter

    Inverters usually convert 12VDC battery power to 115VAC power. Your shore power is likely 115VAC, and the battery charger converts it to 12VDC. I do not expect the inverter to be in that circuit.
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    Power trim -goes up fine; trim motor runs but doesn't go down

    What kind of motor? What year? Older Mercs sometimes have the manual tilt lock jam. I presume you do not have that?
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    Replacing an old outboard on a 1964 MFG Niagara Custom

    The changes needed to electrical and mechanical controls depend on what motor you plan to install. What kind of controls do you have now? 2 lever mechanical control box and ign key on the dashboard? I presume your steering is cable and drum? Newer OBs could be connected to the cable and drum...
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    1973 Sea Ray 190 Fuel Tank Location

    I did not think you could still get a steel fuel tank. It would have likely been OEM for that boat. However, most tanks were aluminum on the 80's and plastic in the 90's and today. You might make sure the fuel tank is marine-rated.
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    1973 Sea Ray 190 Fuel Tank Location

    Not sure about that exact model, however, most boats of that size had the fuel tank under the deck, just in front of the engine. See where the fuel fill is, as the tank is nearby.
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    Gauge & switch lighting

    Daisy chaining is not an issue.
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    89’ OMC 4.3L Winterize Question

    Gee, I bought 4 Gallons of automotive A-F and poured it in after draining the block and manifolds and left it over the winter. In the spring, I drained and saved it for the following winter.
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    89’ OMC 4.3L Winterize Question

    The best way is to pour the A-F into each of the hoses and watch for it to push the water out. You do not need to run the motor, with this method. I used to then reinstall the drain plugs and fill the block with straight A-F.
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