GS 1100 Oil Cooler - 1150 cover or not?

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  • koolaid_kid
    • Jan 2026

    #1

    GS 1100 Oil Cooler - 1150 cover or not?

    I just won a 1150 cooler on ebay. According to what I have read on this forum, I will need to put a restrictor in the oil path to redirect oil to the cooler. The 1150 cover is the most common solution. Has anyone tried to restrict the flow by using a plug instead? I am considering drilling out a rubber plug and using it with the stock 1100 cover. Constructive comments are welcome and appreciated.
  • Guest

    #2
    I would stick with what is known to work. Use the 1150 cover.

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    • Jethro
      Forum LongTimer
      Charter Member
      GSResource Superstar
      Past Site Supporter
      • May 2002
      • 17888
      • The only Henniker on earth

      #3
      Ditto to Bruce. Who knows how much oil is the optimum amount to re-route. You can't plug it off completely, just mostly. A brand new 1150 cover on Bike Bandit is like $30.
      Currently bikeless
      '81 GS 1100EX - "Peace, by superior fire power."
      '06 FZ1000 - "What we are dealing with here, is a COMPLETE lack of respect for the law."

      I ride, therefore I am.... constantly buying new tires.

      "Tell me what kind of an accident you are going to have, and I will tell you which helmet to wear." - Harry Hurt

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      • Mike McNaney

        #4
        Reno and Jethro are right. The 1150 cover restricts and also relieves a certain amount. I got the same info from one of them about the 1150 cover last year when I added a cooler.

        The real important point is that you shouldt use a cooler if your motor doesnt get too hot. Putting a cooler on a stock motor that doesnt get too hot makes it run too cool which will decrease engine life and peak power.

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