Sitting for 7 weeks. bad gas?

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  • doug g
    • Feb 2026

    #1

    Sitting for 7 weeks. bad gas?

    My bike has been sitting for 7 weeks waiting for repairs. (Valve cover gasket and battery).
    Got it all together last night and it runs like crap. Started up just fine but after about 1 or 2 minutes of running it started running real rough at low speeds. Rev the engine and it would clean up a little. Could the gas be that bad after sitting for just seven weeks or could it be electrical? I would have kept working on it but I needed to replace the plugs to make sure it was not them. Today I will drain the float bowls and fill with carb cleaner and let it sit overnite. I wil also drain fuel tank and put frest gas in it along with a new set of plugs.
  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35788
    • Torrance, CA

    #2
    Seven weeks won't cause the gas to go bad. If your carbs were in margional condition though, with old o-rings, the inactivity might have thrown them over the edge. New plugs never hurts so hopefuly that will take care or it.
    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

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    • Dave8338
      Forum LongTimer
      Past Site Supporter
      • Aug 2006
      • 11608
      • Annandale, MN

      #3
      I wouldn't pull the bowls just yet...drain them and then throw some Seafoam in the tank, slosh it around a bit and then set the petcock to prime. Take the bike out and put a few miles on it (topping of the tank with fresh fuel would be a good idea) and you'll most likely have no problems.

      Comment

      • Zooks

        #4
        Ditto ^

        Comment

        • doug g

          #5
          sea foam. never heard of it before. Where does one get it?

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          • lurch12_2000

            #6
            Originally posted by doug g
            sea foam. never heard of it before. Where does one get it?
            If you live by the ocean take your pail and.....just kidding.

            I found it at VIP auto parts for $8 a bottle.

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            • doug g

              #7
              I just checked their site and it says I can pick it up at Pep Boys. Looks like I will stop by there after work and get Sea Foam and some new Plugs.

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