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Automatic Compression Release

Part Number: 28861-07A

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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©2025 H-D or its affiliates. HARLEY-DAVIDSON, HARLEY, H-D, and the Bar and Shield Logo are among the trademarks of Harley-Davidson Motor Company, Inc. Third-party trademarks are the property of their respective owners.
©2025 H-D or its affiliates. HARLEY-DAVIDSON, HARLEY, H-D, and the Bar and Shield Logo are among the trademarks of Harley-Davidson Motor Company, Inc. Third-party trademarks are the property of their respective owners.