2001 75 Merc 4 stroke (carb)

Discussion in 'Outboards' started by KXBill, Jul 26, 2011.

  1. KXBill
    Joined: Aug 2010
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Seattle

    KXBill New Member

    Having low speed idle problems that have gotten worse.:( Won't even start now.
    Suspect carb/s problem. Is there a 3rd source of rebuild kit's for these carb's?
    I found a 3rd source of parts for older Merc's but it seems to dry up for the newer motors. I have 4 carbs that I may be able to rebuild. Merc want's 135 bucks per kit. If their un-build-able, it's 6 to 7 bills each, for new carbs.
    I'm not ready to give up Boating but I tell yah, Kayaking is looking real good too me.:)
  2. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 148, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    Check for fuel hose leaks. These engines have a lot of short hoses between the carbs and longer ones from the bottom carb to the fuel pump and filter, all of dubious quality.
    If the pump sucks air only the lowest carb gets enough fuel at idle rpm, causing the engine to stall. If it worsens, it won't start at all.
  3. Frosty

    Frosty Previous Member

    Number 1 test,-- pump the bulb while its running, if it recovers it the supply.

    Leaking hoses will result in fuel leaks when priming also.

    However being slow speed problem rules out a fuel supply anyway.

    Fuel starvation would manifest itself at high speed.

    I would not pay 135 bucks either but I would still strip them a lot of bits are just O rings and gaskets, patience and a steady hand with some scissors will make gaskets.

    Your prob will only be the idle circuit any way.
  4. kenJ
    Joined: Jul 2005
    Posts: 349
    Likes: 5, Points: 0, Legacy Rep: 56
    Location: Williamsburg, VA

    kenJ Senior Member

    You may want to run some Seafoam through the engine. Pour it in the gas tank, run until the engine starts smoking. Shut off let it sit over night then run again. Seafoam is an amazing solvent for cleaning carb deposits. The engine will smoke until the seafoam is gone.
  5. Frosty

    Frosty Previous Member

    Seafoam,---Or you could get some feathers on a stick and put some paint on your face and dance around it at midnight carefully shaking the magic stick over the offending carburettor.

    If you have any left it can cure Lumbago and all other ailments. A fresh tank of gas would better than one with Jet A1 fuel in it.
    Save the money for some gasket paper.

  6. pistnbroke
    Joined: Jan 2009
    Posts: 1,405
    Likes: 34, Points: 48, Legacy Rep: 404
    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    I dont think frosty likes Sea Foam
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