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    four stroke merc runnability

    Carb four cycle motors will have primer bulbs. EFI and FI motors have electric fuel pumps and often no primer bulbs You might take a compression test to see if the motor is healthy. usually service manuals have fuel pump output and/or pressure tests.
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    need help finding part 94 mercury 40hp carb part

    I did not find on on the web. A OB salvage yard is a distinct possibility. Also a plumbing parts store, or even the Home Despot should have a hose barb to threaded adaptor. The question is whether the thread is NPT, and whether that tapered area is needed. You could always drill the hole, if...
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    Stereo Replacement Wiring Questions

    The wires from power and ground TO the stereo can be thicker than the ones on the stereo, but not the other way around.
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    Water in fuel

    Gee, my shake-shake siphon will siphon 6 gal of fuel in 5 minutes or less. It has quite a large diameter capacity and doesn't require electricity and lasts for decades. How old is the gasoline? If it is not too old, it should be fine to use after the alcohol/water mix is out of the tank.
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    Stereo Replacement Wiring Questions

    A lot of stereos have a wire hooked directly to the battery to keep the radio stations and other items saved in memory. It takes a small amount of power drawn continuously from the battery to do this. Since boats sit for weeks, I hook them these to the switch, and reset the radio stations and...
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    Low compression Suzuki OB: 105...105.... and 65

    I doubt those cylinders will clean up with a honing. You might inspect the piston tops to see if they are std size or oversize, as you will likely need oversize pistons and rings, for the machine shop to bore it properly. The real question is how much oversize boring do you need to clean up...
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    1990 Mercury 175 Overheat warning possible causes?

    The usual causes for overheat are worn water pump parts, bad thermostats, and faulty poppit. If you fix those and she still shows overheat, it could be your head gasket(s) leaking. Put a torque wrench on your head bolts and see if they are loose. Those motors had a tendency for them to loosen...
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    1984 75hp L4 with unique problem? I'm baffled!

    Gee, I hope that works for you. I never found the bleed restrictors to do anything but lower the quality of the idle. Maybe your motor is different than my IL6 and Il4 motors.
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    Water in fuel

    Letting the water settle to the bottom of the tank is a good idea. Now siphon from the bottom of the tank, into a clear container. One of those "shake-shake" siphons work's well. You should let the clear container settle and you should be able to see the different layers. If in doubt, a...
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    Mercruiser trim pump has a leak.

    The reservoirs tend to crack when the single mounting bolt is too tight. So tighten just enough not to leak.
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    Cooling problems

    That waterpump should create 30+PSi at cruise speed. I have never had any issue with them but remove the water grates and see that the passage is clean. A couple of notes. The gasket under the wearplate is glued to the gearcase. The oring under the SS cup uses some silicone to retain it, 4...
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    Winch replacement suggestions

    In my experience, West Marine never has the best price on anything, but they can be convenient.
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    9.8 110 mercury wont throttle up anymore

    Check the compression to make sure she is not damaged. If compression and spark are good, try richening the carb idle mixture 1/8 turn and see if that helps. The larger Mercs (IL4, IL6) of that era needed a rich idle mixture to allow them to rev up. If you set the idle mixture to idle...
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    Winch replacement suggestions

    Winch straps sit in the sun all the time. After some time, they get rotten and brittle. Then they wait for you to winch the boat up, and at the worst time, they break. So either change them every 3years (Depending on how much sun they get) or go with cable. I swapped my strap for a 3/8"...
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    Bigfoot runs for 2 seconds and dies

    The carb may need to be cleaned. First test is to remove the high speed jet cover bolt and pump the primer to see if fuel runs out. If it does, then it is likely the carb idle circuit is clogged. If no fuel then the inlet needle is stuck or some other part of the fuel system is clogged. You...
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    No spark on Merc 85hp

    If she popped with fuel sprayed into the carbs, it sounds like the carbs need some attention. One more thing. The trigger on your ignition can become intermittent. They can work for some days and then fail, and then work for some more time. Also, check the spark plug wires for resistance and...
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    Bigfoot runs for 2 seconds and dies

    Carb, EFI or something else?
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    96 Johnson 150 Setting idle

    Since you are doing your own work, you might invest in a factory service manual. Marineengine.com sells them. Have your model number handy.
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    What do these knobs do?

    In the old days, carb jets were adjustable for both high speed and low speed. That appears to be what you have. More modern carb engines just have low speed adjustments, and high speed jets are fixed. It was especially fun to adjust the dual highspeed carb jets on my '58 Fat-fifty, since you...
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    No spark on Merc 85hp

    If you spray 50::1 fuel into the carbs and she doesn't at least "pop", you have no spark, or the timing is way way off. A '73 will have timing marks on the upper cowl support. Remove spark plugs and stick a screwdriver in the top spark plug hole. Set that piston to top dead center and look at...
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