APE cylinder head nuts

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  • Katzukes
    • Jan 2026

    #1

    APE cylinder head nuts

    Has anyone had a problem with the #1 and #3 nuts on a gs1100. I have APE studs and the nuts won't slide down the recess. I tried another head and it's the same thing. What can I do to make it work.
  • blowerbike
    Forum Guru
    GSResource Superstar
    • Aug 2008
    • 7057
    • Ohio Closer to KY Than Cleveland

    #2
    Originally posted by Katzukes
    Has anyone had a problem with the #1 and #3 nuts on a gs1100. I have APE studs and the nuts won't slide down the recess. I tried another head and it's the same thing. What can I do to make it work.
    on 80-83 1100 16v. engines you only use 6 of the HD nuts.
    4 factory nuts on the corners(valve cover) and the 2 front center factory nuts with the o-rings.
    on an 1150 head you can use all 12 HD nuts.

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    • Katzukes

      #3
      Thank's, do I torque all the nuts to the same value.

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      • Katzukes

        #4
        The APE nuts are torqued to 36-42ft lb, do I also torque the stock nuts on APE studs to APE settings or Suzuki torque values, which are 25-29ft lb.

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        • blowerbike
          Forum Guru
          GSResource Superstar
          • Aug 2008
          • 7057
          • Ohio Closer to KY Than Cleveland

          #5
          38lbs on all nuts for a carbureted engine sounds good.
          i have went 45lbs on my turbo set up's but on customer bikes i always used 40lbs.
          there is a fine line on pulling the threads out of the engine case.

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          • Katzukes

            #6
            Thanks for the response blowerbike.

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