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tohatsu not firing

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  • tohatsu not firing

    hi all l,m new to site hop same one can help i have a 2006 tohatsu 18hp not firing on bottom cylinder got it off a mate so fare he changed carburettor for new one new coil new head gasket new thermostat checked compression 120 psi top cylinder 118 psi bottom cylinder new spark plugs checked timing new fuel line and tank it tyres to fire at about 1/2 to about 3/4 and same time it will pick up and go but if you back off to under about half throttle it will mis and stop firing on bottom cylinder tryed pulling plug wire off when idling top wire motor stops bottom wire makes no different to motor

  • #2
    Welcome to Iboats,

    Gee have spend lot of cash with no avail, that's the hardest and most expensive way to troubleshoot any motor. By coil, you mean the double Ignition Coil ? When carb fully opens up at which time advance mark does the timing plate stops righ in middle of both vertical mating surfaces ?

    BTW, is it a 2 or 4 strokes motor ?

    Happy Boating


    Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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    • #3
      You need to run the electrical tests on the ignition components. Those procedures and specs can be found in the service manual. Once you have eliminated the ignition system you can start in on the fuel system and eliminate the possibilities by trial and error.
      Elvin
      My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

      The 3 Rules:

      1) Look in your service manual first...Then ask me if it is correct.
      2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
      3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

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      • #4
        2 stroke checked timing 25 degrees full throttle 3 degrees no throttle changed coil one with spark plug leads he was told it was faulty by mechanic he checked cdi unit and coil under flywheel and was told they where good witch way the arrow run on the pipe with the value in it can not find it in repair Manuel

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        • #5
          update toke boat to mechanic he can fix it

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          • #6
            Just for the record, report what was wrong with it.

            Happy Boating


            Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

            Comment


            • #7
              mechanic found new carburetor was blocked he had to use air and wire to unblock same think was in there from factory he also give it a tune up haven't toke it out will take out tomorrow to see how it goes

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              • #8
                Good to read that carb was found faulty, which type of boat will be powering that nice OB and how loaded do you intend to use it ?

                Happy Boating


                Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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                • #9
                  Sign up today
                  carburettor was fault but still the same back at machines try again will keep updated

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