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.
...Read MoreFits '07-'17 Twin Cam-equipped models. Can be used with Original Equipment or Screamin' Eagle® Cylinder Heads. Does not fit with Twin-Cooled engines.
* Harley-Davidson® Credit Card is a credit product introduced by Harley Davidson Financial Services Europe Limited and provided by Tymit Limited. Tymit Limited is authorised and regulated by the Financial Conduct Authority to perform regulated Consumer Credit activities (FRN:796994) as a lender. [Harley Davidson Financial Services Europe Limited] is an Introducer Appointed Representative of Tymit Limited for the Harley-Davidson® Credit Card products. This link, image, and content related to it is owned and operated by Harley-Davidson Financial Services Europe Limited, as an IAR of Tymit, Ltd. Harley-Davidson Motor Company has no legal interest or ownership in any of the above.