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
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Where Used In Parts Catalog
*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 BOX | Valve 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.
*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.