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    Mercury 85hp runs fine on Muffs but Boggs down in Sea

    You should be able to leave the carbs open. Can you not get to the mixture screws with the airbox installed? just curious.
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    What Control Box do I need? 8 pin or 10 pin'?

    Looks like an 8 pin connector. The other wires would be for trim and tilt. Not sure what cables you need.
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    Propeller size for 1977 mercury 1150

    Try trimming it while on plane. You are looking for 5500RPM.
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    Propeller size for 1977 mercury 1150

    NADA says boat weighs 950#. Engine is 300#. Trailer is likely about 300#, but it's weight should be avail at the trailer OEM web site. You might weigh is, as 17P prop is what I would expect would work fine. Tacho is accurate? Motor is running on all cylinders?
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    Replace stop button with kill switch

    Black/yellow is the wiring color for the ignition kill circuit on most OBs. Black is the wire code for ground on most OBs. Connecting those together will kill most ignitions. I have never researched your motor however.
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    1984 Mercury 50 confused!

    Are both carbs opening fully? Sometimes linkage between them slips.
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    Replace chain on floating dock - recommendations?

    I would expect galvanized chain used for boat anchors (proof), to last 20+ years in fresh water. 1/4" chain or heavier if you want should work.
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    12V armature

    When you say armature, you mean field coil, right? Field coil should be attached to the outer casing. Both armature and field are coils. On the other hand, for that PTT unit, the pump holds the bottom of the armature. if you removed the motor from the pump unit, the armature bottom will...
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    2000 Johnson 200 runs reverse( fly wheel spinning backwards) HELP , ITS CURSED!!

    Sounds like you need to check your timing. If the spark happens too soon, a 2 cycle engine can start backwards. Merc used that feature for reverse on it's direct reversing motor.
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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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