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    Fuel delivery

    I have one of those glass fuel filters (coming out of the fuel pump) and it wont stay filled up. I have rebuilt the fuel pump which included the 2 check valves. Even pumping the primer bulb doesn't help. What would cause this? 1986 150 HP blackmax.
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    Stator

    Genuine Quicksilver or aftermarket (CDI, Sierra)? What would you recommend and why?
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    Overheating

    I have a 1986 Merc 150 blackmax. Took it out last week and was running like a champ. As I was loading the boat on the trailer I noticed that there was no water coming from the pee hole. The motor obviously got hot. I don't know how hot it got. I replace the water pump and the thermostats...
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    Leaking from carb.

    I have an 86 blackmax 150 hp. I have fuel spewing out of this thingey. See attached picture. What is causing this. Try this. I was having a diffucult time inserting a pic. I got it figured out now.
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    Parts Interchange

    Is there a web site that can cross reference to see if the same parts work on multiple years and models? It would be Mercury brand. Thanks
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    20" or 25" shaft

    How do I tell which one I have? What exactly is being measured?
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    '86 blackmax 150 hp: Loss of Power

    I have always had problems with the motor ever since I bought the boat 2 years ago. My latest issue has been the motor would occasionally lose power after a long outing, 20 to 30 miles. I would have to throttle down to avoid stalling. Then it would get back on plane, then do it again. It...
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    Spark plug wires

    The Mercury part number for my plug wire is 84813715A1. They are kind of pricey from Mercury. I noticed Sierra has plug wires that are cheaper. I'm having a difficult time cross referencening the Sierra part number. Can someone help me out? Thanks
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    Steering Problems

    I have an 86' 150 blackmax. The steering required a feat of ultimate strength to turn. I disconnected the steering cables and noticed that it is difficult to turn the motor by hand. I ended up buying a transom bracket complete with steering pivot off some dude on Ebay. It looks like it is...
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    Shocking issues

    I have an 86 150 blackmax. I've been having an ongoing problem with this motor since I brought it back from the grave 2 years ago. It only acts up near the end of the day. The motor starts to bog down intermitenly. Like something is getting hot. When I got the boat home I put it on the muffs...
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    Hard to turn

    I have a 20' sport craft with a 86 merc 150 blackmax motor. It is a bear to turn right, but real easy to turn left. I have the anode trim cranked all the way to help counter this, but it has no effect. Any suggestions. It really makes boating un-pleasant, especially if your hands are wet on...
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    Just changed the impeller

    I have an 86 150 hp blackmax. Just changed the impeller. I tested it on the muffs and the stream from the tell tale hole is not as good as the older impeller. Will it have a better stream if the motor is in the water as opposed to being hooked up the muffs? Another question, does the...
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    Motor boggs down after on plane

    I took the boat on a 30 mile run. One mile before our destination, the motor bogged down an I had to throttle down before it stalled. Sat for a minute then it ran fine. As the day progressed, it started acting up more frequent. It got to the point where I can only go 8 knots. It definetly...
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    Tilt/Trim will not go down all the way

    I have an 86 150 hp black max. It has the integral system with 2 trim cylinders and one tilt cylinder. I finally got the tilt trim motor replaced. all works fine except it does not go down all the way. It is being held up at the 2 trim cylinders. I have to use the manual release valve to...
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    Fuel line diameter.

    I have an 86 150 hp black max. I have read on this forum about fuel line diameter being no less than 5/16 and up to 3/8. When I got the motor it had 1/4 diameter. If I switch to 5/16 or 3/8, do I need to change the fittings on the carbs and the fuel pump? For example the fuel pump hose...
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    Stator

    What is the correct stator part number for my motor? 86 150 hp black max. SN# a942647 No voltage regulator Thanks
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    88 150hp black max hard to start

    I have a hard time starting it when it is cold. Sometimes I can run the battery down before it starts. I have checked the enrichener and it clicks. I pumped the bulb and then removed the bottom hose and pushed in the key and fuel would spurt out with every click. Is it supposed to spurt or...
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    Motor boggs down after it's on plane.

    1988 mercury 150 hp black max. I took the boat out tonight, and while making a run the motor just bogged down and stalled. Started it back up and tried again. Had to feather the throttle to get back up on plane again. It did it again. Sometimes it will go for a minute sometimes it goes for 5...
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    Tach only works with key

    I have an 86 merc 150 hp blackmax. The tachometer works when the key is turning the engine. As soon as you let go of the key when the motor is running, the tach doesn't work. Any suggestions?
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    Timer pointer adjustment on 86 Merc. 150 hp. blackmax

    I am trying to do a link and sync. The first thing the Seloc manual tells you to do is adjust the timer pointer. Has anyone done this before? The instructions do not make any sense! What is the purpose of turning the motor counter-clockwise? There are dozens of models that have different...
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