S&S Cycle Electronic Compression Release Kit for 1999-Up Harley-Davidson Big Twin with S&S Heads

S&S Cycle Electronic Compression Release Kit for 1999-Up Harley-Davidson Big Twin with S&S Heads

Turning over a high-compression engine places real stress on starter components, and that stress accumulates in ways that shorten component life on demanding builds. S&S compression releases vent combustion chamber pressure at the push of the start button, reducing cranking load so that powerful S&S Big Twin builds start cleanly without putting unnecessary strain on the electrical system.

Key Features

• Electronic solenoid design opens automatically when the start button is pressed
• Closes automatically when the start button is released
• Reduces starter motor and solenoid load on high-compression S&S builds
• Manual option also available for rider-controlled operation
• Mounts directly in S&S performance heads

Technical Specifications

• Operation: Electronic solenoid, start-button activated
• Activation: Opens on starter engagement, closes on release
• Compatible Heads: S&S performance heads with compression release ports
• Part Number: 90-4915

Fitment Notes

• Requires S&S performance heads with compression release ports; not compatible with OEM heads
• Fits 1999-Up Harley-Davidson Big Twin frames and electrical systems
• Verify head compatibility with S&S before ordering
• Review the Fitment tab for complete year and model breakdown