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Automatic Compression Release

Part Number: 28861-07A
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Automatic Compression Release (ACR) valves reduce the strain of starting your high performance motor by reducing cylinder compression - automatically! The engine is easier to turn over resulting in less wear on your starter and battery. After start, the ACR valves close to restore full compression.

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    • Question:
      2/8/2025
      Why is a 2015 Road Glide Special not included in the fitment description? What makes that motor unique?
      Dave - Denver
      • Answer:
        Hello Dave, Please visit your local H-D Dealer for technical assistance. Thanks blairmke
    • Question:
      1/15/2024
      What is the difference between these ACR's and the ones for a twin cooled head?
      Darkside - CT
    • Question:
      7/30/2023
      I have a 2012 Super Glide Custom with a 96 to 103 stage 4 kit on it , so I have the CNC Heads. What automatic compression release valves and wiring harness do I need to work properly.
      Craig - Syracuse, NY
      • Answer:
        Hello Craig, For better assistance please visit your local HD Dealership as this is a technical question. Hope this helps! Thanks
    • Question:
      11/29/2022
      What models come with ACR from the factory? I could've sworn I saw some on new 103 twin cam.
      Slowpoke96z28 - Earth
      • Answer:
        Hello Slowpoke, Some police models came with acr in 06, if i remeber right touring 103 in 07 had them then softail 103 added them. Gigglesthehelper
        Gigglesthehelper
        Helpful?
    • Question:
      1/31/2022
      I have a 2008 FLSTC with a manual compression release on each head.. Installed by Harley Dealer, can the ACR be installed in the same holes after they do the software fix??
      Retired Trooper - Chalmette
      • Answer:
        Hello Retired Trooper, So most manual ACR's are on the outside near the spark plug hole. These go into the top of the head ( out of sight out of mind). SO with out knowing the thread pitch and all measurements i cant say it they will fit ot not. Gigglesthehelper
        Gigglesthehelper
        Helpful?

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    Automatic Compression Release