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  1. C

    coil check values

    OK, let me guess what kind of motor and coil you have. On my mercury motor (year and HP intentionally left off), the primary winding of an ignition coil is .02-.04 ohms resistance. The secondary winding is 800 - 1100 ohms.
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    Merc 90 2smoke wont fire

    Carbs could still be dirty. Are you choking it? is the cold start lever or throttle only button being used?
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    Motor slow acceleration then overheat

    Switchbox issue. Best to replace both of them.
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    Is 90hp ob enough??

    The OB boat will have the most room in it. The I/O motors have the large doghouse, which eats up floorspace. I like the OB. The power will be fine for most applications.
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    Mercury 50hp 2 stroke

    Looks like a bad powerhead base gasket. The only cure is to pull the powerhead, clean the mating surface and install a new gasket. I find it easier to pull the gearcase first. Rebuild the waterpump if it needs it, and while that is off, pull the powerhead.
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    1978 Mercury Black Max V1500, Surging at high throttle.

    Does the engine rev up, or just run at just above idle? 6MPH is probably somewhere around 2000RPM, on most boats. Do your RPMs exceed 2000? If so, the prop hub may be bad. if not, your motor is not making proper power for some unknown reason.
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    Motor slow acceleration then overheat

    Check the torque on the cylinder head bolts. I have had those engines have them loosen up over time. Are all cylinders firing? Are all spark plugs the same color?
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    Engine power loss

    Your compression is fine. I think your shop is part of the problem. Bent propshafts cause noticeable vibration in the drivetrain, and corroded bearing carriers don't cause any issues at all. They probably just needed to make that balloon payment. if your engine revs up and has a load on it...
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    Trim Sensor Wiring

    The trim sensor is likely brown/white at the engine. The gauge will also need power and ground. On the engine they are purple and black, respectively. Not sure about Smartcraft wiring colors. Your motor does have a trim sensor? Not all did.
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    prop for Mercruiser Alpha One

    Did the prop hub survive? Did your gearcase survive? When a SS prop is that bent, other damage will occur. Prop numbers could be under prop nut or on rear of prop.
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    Aluminum manifolds and risers

    Do some research on them. The last time I checked it out, they were not very compatible with MerCruiser engines. The issue was heat expansion of the aluminum manifolds, versus the heat expansion of the cast iron heads of the MerCruiser. I do not have a source, unfortunately.
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    prop for Mercruiser Alpha One

    Look for the numbers on your current prop. It will have diameter and pitch. If you liked the way it performed, buy another one with the same pitch. If the motor did not rev up to max with a light load, get a lower pitch. If it overreved, get a higher pitch. Figure +- 400 RPM per 2 inches of...
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    power trim-slow death

    OK Dingbat, if the voltage is lower at the PTT motor, will the PTT motor get more or less amps? Will it run faster or slower with less voltage? I am trying to keep it simple.....
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    Mercury Outboard parts - what's happening?

    The answer is to order from places who have the item in stock. There are lots of places on the web to get a prop. Pick one who has what you want in stock for a price you are willing to pay. Just so you know, I bought a prop for $300 recently. It was also available at places for $350, $400...
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    1988 L6 115hp idles and runs well at half throttle and WOT, but falls flat when put in gear at idle if I don't goose the throttle immediately

    0-9*ATDC is the range, broad or not. Make sure the motor is warm and the fuel mixture is spot on. This assumes the carbs are clean, carb floats, inlet needles and gaskets are good and adjusted properly.
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    power trim-slow death

    Electricity makes the motor run. More voltage = more trim motor speed. Accordingly, check the electrical connections for corrosion.
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    Shift cable

    Normally cables match the engine. What brand of engine do you have?
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    1988 L6 115hp idles and runs well at half throttle and WOT, but falls flat when put in gear at idle if I don't goose the throttle immediately

    Your issue is likely hat the carb idle mixture is too lean. Set the idle pickup timing to 0-9*ATDC. Set max spark advance to 21*BTDC. Don't change them. Set the carbs to 1-1/2 turns open. Using fresh 50::1 fuel, adjust the carbs one at a time. So, with carbs open 1-1/2 turns, try to...
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    Did my lower unit get damaged?

    Shift shaft seals do leak. They are easily replaced. I ground a 1/2" black pipe coupler into a spanner to tighten the new seal.
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    Removing PTT

    Well, pull off the starboard side transom bracket. that allows the entire PTT system to come off.
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