Mercury 70 hp bogs down at full throttle.

Discussion in 'Outboards' started by willyyes, Mar 25, 2011.

  1. Milehog
    Joined: Aug 2006
    Posts: 504
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    Location: NW

    Milehog Clever Quip

    Ethanol based fuel is always suspect in my book. I've had good luck cleaning low and medium speed carburetor fuel circuts by adding Chevron Techron additive to the fuel. Don't get the carb-injector cleaner with Techron. Get the 20 (?) ounce bottle of Techron additive.
    The engines that bog after a few seconds at high throttle settings may have fuel starvation issues. I've heard of salt building up around the fuel line in tight places choking off the supply.
     
    Last edited: Aug 9, 2011
  2. Frosty

    Frosty Previous Member

    Fuel filters replace . fuel cap try it without the fuel cap on, change the fuel pump, check the auto choke bimetal spring is adjusted correctly.

    See how you go with that, try one at a time.
     
  3. kayant1
    Joined: Jun 2011
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    Location: long island ny

    kayant1 Junior Member

    i will try that thank you ,, i'm surprised that only under load it happens it starts up with a tap of the key cold or hot and i rev it up still nothing this is my first boat now i know why they say(B)rake (o)ut (A)nother (T)housand
     
  4. El Sea
    Joined: Aug 2006
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    Location: St Petersburg, Florida

    El Sea Junior Member

    How old is the fuel?
     
  5. kayant1
    Joined: Jun 2011
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    Location: long island ny

    kayant1 Junior Member

    fuel is fresh 2 weeks old with star-tron ethanol buster
     
  6. Frosty

    Frosty Previous Member

    I think there is a little fuel stainer on the feed pipe on the carb, clean it.

    I am assuming it is fuel as it runs ok up to a certain RPM then hasnt enough fuel to go more.

    I am also assuming you know enough to check the prop for damage and that at one time the engine ran ok. If you have just bought it and its never ran properly well thats gonna be different.
     
  7. kayant1
    Joined: Jun 2011
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    Location: long island ny

    kayant1 Junior Member

    thanks frosty the prop is new and so is the engine im going to clean out the filter on the carb and install a new water separator filter in it is slowly getting worse maybe there's crap in the tank that i pulled up i will be taking her out Thursday i hope that's all it was,,, i will let you know what happens thanks again for your input we need more people like you
     
  8. kayant1
    Joined: Jun 2011
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    Location: long island ny

    kayant1 Junior Member

    and does any body know what was the stock size prop that came with my boat Chris craft Amerosport 230 1988 right now im using a 15 1/2 x 17 pitch im just curious what came with that boat
     
  9. kayant1
    Joined: Jun 2011
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    Location: long island ny

    kayant1 Junior Member

    clogged fuel filter in the carb/ that's what it was thank you
     

  10. kayant1
    Joined: Jun 2011
    Posts: 14
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    Location: long island ny

    kayant1 Junior Member

    clogged fuel filter in carb thank you
     
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