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  1. #1

    Default Tohatsu 6hp runs better with engine cover off?

    My 2005 Tohatsu 6 hesitates and sputters a bit but as soon as you remove the cover the idle goes up and it accelerates normal? I have cleaned the carb thoroughly but my guess is its starving for air? Is there any kind of sensor on these?

  2. #2
    Join Date
    Mar 2010
    Location
    Buffalo, NY, USA
    Posts
    2,080

    Default Re: Tohatsu 6hp runs better with engine cover off?

    Year of manufacture is irrelevant for servicing Tohatsu outboards; Model and Serial are what you need to have to describe the motor. Assuming your model is MFS6B. No, there isn't any O2 sensor of anything like that. Either the air inlet of the cowl is plugged, or the carb is way way too rich, or you have an exhaust leak.
    Paul
    Buffalo NY USA

  3. #3

    Default Re: Tohatsu 6hp runs better with engine cover off?

    Quote Originally Posted by pvanv View Post
    Year of manufacture is irrelevant for servicing Tohatsu outboards; Model and Serial are what you need to have to describe the motor. Assuming your model is MFS6B. No, there isn't any O2 sensor of anything like that. Either the air inlet of the cowl is plugged, or the carb is way way too rich, or you have an exhaust leak.
    xhuast hav ea wMFS6AS,



    Where do you think would be the most likely culprit for a exhaust leak? I do see some build up of oil and crud at the exhaust port plate under the head. Also I can smell exhaust right under the carburetor.

  4. #4
    Join Date
    Mar 2010
    Location
    Buffalo, NY, USA
    Posts
    2,080

    Default Re: Tohatsu 6hp runs better with engine cover off?

    Base Gasket perhaps.
    Paul
    Buffalo NY USA

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