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Power loss after putting in unleaded fuel...what to do?

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    #1

    Power loss after putting in unleaded fuel...what to do?

    As the title states, I mistakenly filled up with unleaded fuel, instead of LRP. The bike has lost a huge amount of power and now hits only 60km/h tops. Would the fuel account for this?
    A friend reckons I could put two capfulls of 2 stroke oil in the tank, but I don't want to take chances. Also, the engine states 10w40 oil, but I could only get 20w at the service station. Is 20w ok? I live in Cape Town and it is pretty warm.
    Any advice, please?
    Tags: None
    #2
    Main concern is the power loss, seems like it can't just be the fuel...

    Comment

      #3
      We use unleaded all the time, we have no choice in the matter, so the "unleaded" part should not matter. However, how fresh is the fuel? It is not unheard of to have water in the tanks at the station. Try draining the float bowls and the tank, fill with known-fresh gas and try again.

      Oil. You say 20w. Was there anything after the w? Like 20w-50? A straight 20 oil is too thin for normal use, but a multi-weight 20w-something (usually 50) is fine, but recommended for warmer temperatures, which are probably ending for you.

      .
      sigpic
      mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
      hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
      #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
      #2 son: 1980 GS1000G
      Family Portrait
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      Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
      (Click on my username in the upper-left corner for e-mail info.)

      Comment

        #4
        Right so...turns out that actually the bike is only firing on left side, no spark on right

        Comment

          #5
          Oil is fine, found what I needed and read up on oils

          Comment

            #6
            How long since your last valve adjust?
            Ed

            To measure is to know.

            Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

            Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

            Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

            KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

            Comment

              #7
              This has to be electrical. The head light also only goes on when set to bright.

              Comment

                #8
                Rather than read up on oils, you should start investigating coils.
                "Thought he, it is a wicked world in all meridians; I'll die a pagan."
                ~Herman Melville

                2016 1200 Superlow
                1982 CB900f

                Comment

                  #9
                  Believe you might be right, though I'm hoping it's just a short somewhere. I'm going to ask in the electrical sub forum.
                  Last edited by Guest; 03-13-2017, 12:18 PM.

                  Comment

                    #10
                    Just a quick update. Firstly, thanks to all who weighed in here, appreciate your time and trouble. Secondly...it turned out to be just a dirty plug, both cylinders are firing again! Sorted it myself, feeling very happy. The headlight therefore must be unrelated and probably just requires a bulb.

                    Comment

                      #11
                      Cheers, Journeyman!
                      "Thought he, it is a wicked world in all meridians; I'll die a pagan."
                      ~Herman Melville

                      2016 1200 Superlow
                      1982 CB900f

                      Comment

                        #12
                        The question about valve adjust was never answered.
                        Ed

                        To measure is to know.

                        Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                        Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                        Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                        KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                        Comment

                          #13
                          A blown bulb can mean a regulator not regulating properly. Usually it just means a blown bulb, but I would check on the voltage at the battery with the engine running to make certain that with a fully charged battery at 5000 RPM you are not over about 14.5 volts.
                          sigpic Too old, too many bikes, too many cars, too many things

                          Comment

                            #14
                            Apologies! With regard to valve adjust, not sure. It's next on the maintenance list.

                            Comment

                              #15
                              Watch those Fowling plugs, I went through four sets of them before I realize my float levels were not adjusted properly!

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