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Type: Posts; User: galamb

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  1. Replies
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    Re: 1980 Mercury 20 Hp, Fuel Issue

    A bad crank seal won't effect the compression numbers. Only effects the fuel/oil/air ratio getting into the cylinder, so a compression test or even a leak down gives you no information about the...
  2. Re: Serial No. doesn't match Mercury configurations Scheme

    In 1986 Merc introduced an entirely new line of many of their models.

    In preparation they started building them in the latter half of 1985.

    Up until that point (1985) all the serials...
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    Re: Would a Kill Switch Cause

    If you mean "stop completely" as in "zero ignition at all" it is technically possible but unlikely.

    If you mean "stays running at reduced power" then the answer is no.
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    Re: Mercury 200 20 hp

    4714029 would make it a 1977 Model 200 (20 horse).

    You don't have "enough digits" for the first character to be an "A" and the A7000 series would make it a Canadian Built motor (but there would be...
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    Re: 1980 Mercury 20 Hp, Fuel Issue

    I'm with Jeff on this one.

    If you test the spark and get good results on the lower plug lead then I would bet on a lower crank seal.

    Fairly common issue on the early 80 something portables and...
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    Re: 40 hp serial number OG195343 ?

    The 40 horse (prop) and 30 horse (jet) are the same powerhead exactly, it's just the lower end that is different.

    So mechanically on the engine end they are the same unit.

    The Jet is only rated...
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    Re: Prop shaft not turning very easily

    Before I started chucking megabucks on a new lower (or into a shop for a rebuild) I would give it one last chance.

    What "I" would do is clean out the lower unit well (diesel fuel works well) -...
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    Re: 1983? Mercury 25hp

    Yes, it is a 1983 model according to your (production) serial number.
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    Re: Need help finding model and serial numbers

    Pictures may help.

    Hurricane's were about 20 years "before" the 70's.
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    Re: Mercury outboard.

    The ignition coil produces AC so as Jeff notes you need a (direct voltage adapter) to convert it to DC so it can be measured accurately.

    If it has good continuity (very low resistance) between the...
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    Re: Attenuator plate ?

    Supposed to make it quieter..
  12. Re: 1988 mercury 9.9hp 2 stroke won’t get up to gig rpm

    Or it has been running very cold (without the optional thermostat).

    They (thermostats) are about 20 or 30 bucks with a new cover gasket (aftermarket is fine).

    Worth putting in - helps keep the...
  13. Re: How to check if speed is good on 20hp mariner outboard motor

    I have a 14 foot deep v aluminum (Princecraft Fisherman) with the console installed (used to be an option).

    With two of us in the boat, plus our junk, pushing it with a 15 horse Mariner (1991...
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    Re: 1996 mariner 25hp flywheel

    Epoxy it back on exactly where it came from.
  15. Re: 1988 mercury 9.9hp 2 stroke won’t get up to gig rpm

    These did not have a thermostat from factory, it was an "option".

    Sounds like they replaced everything they could and didn't bother to clean and/or rebuild the carb which sounds like maybe part of...
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    Re: Old Merc 7.5hp low speed issue

    That's a 1977 Canadian built model (Merc in Mississauga).

    What you are describing sounds like some cooties in the carb.

    Since it's "somewhat working" you could try running some seafoam in your...
  17. Thread: 1968 900

    by galamb
    Replies
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    117

    Re: 1968 900

    If the year is correct they didn't make a 90 that year - in 68 there was a 50 (4 cylinder), a 65 (4 cylinder) then the next model in the line-up was a 100 horse (6 cylinder) with "nothing" in between...
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    Re: Mercury 1970's 2 Stroke 3-Cyl

    I have that serial listed as a 1975, made in Belgium.

    The US serial (equivalent) for parts look up would be (starting serial) 4136685


    And here is the link to parts listings from this forums...
  19. Re: 1986 9.9 dieing when connecting fuel lines

    If it pukes out gas from the carb when you squeeze the fuel bulb either the float height was incorrectly set or there is a problem with float needle valve (or it's seat) - both of which "would have...
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    Re: Mariner 1984 20hp 2Stroke Gear Oil

    The original spec called for 90 weight Hypoid Gear Oil.

    Today you can use any GL-4 or GL-5 80/90 or 75/90 weight oil that is marketed for marine lower units.
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