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Automatic Compression Release

HD-28861-07A

Harley-Davidson®

28861-07A

28861-07

New product

United States

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.

  • ACR can be installed on stock or Screamin' Eagle® Performance cylinder heads for all '07-later Twin Cam equipped models
  • Install requires machining to be performed by a competent machinist using the Screamin' Eagle® Automatic Compression Release Fixture Kit P/N 94648-08 (sold separately)
  • Installation requires separate purchase of model specific ACR Wiring Harness

More details

Harley-Davidson®

$ 55.78

Available to backorder Extended delivery

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Where Used In Parts Catalog

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*Fitment details are provided in good faith and do not guarantee suitability for your bike. If in any doubt please contact our parts department before ordering.

Product Information

IN THE BOXValve only

More info

  • These Screamin' Eagle® products are 50-state street-legal for sale and use on all vehicles, including those that are pollution controlled. Complies with the requirements of 40 CFR Part 86, subparts E and F.

Bike Fitment

Fits '07-'17 Twin Cam-equipped models. Can be used with Original Equipment or Screamin' Eagle™ Cylinder Heads. Does not fit with Twin-Cooled engines.

Select fitment by year

*Fitment details are provided in good faith and do not guarantee suitability for your bike. If in any doubt please contact our parts department before ordering.