S&S Cycle Manual Compression Release Kit - 90-4925

Item # : 208850

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  • Manufacturer: S and S Cycle


S&S Cycle Manual Compression Release Kit

  • Designed to be used in S&S cylinder heads for Twin Cam, 4in. bore Evolution big twin, and Super Sidewinder Plus style S&S engines
  • Consists of a small valve that opens during starting and allows a portion of the cylinder pressure to escape into the exhaust port of the cylinder head
  • Reduced cylinder pressure makes it easier for the starter to turn the engine
  • When the engine starts, the valve closes and the engine runs normally, with full compression
  • Manual compression releases are activated by a cable similar to a choke control
  • Before starting, the handle is pulled, which opens the compression releases. When the engine fires, the increased cylinder pressure automatically closes the compression releases
  • Can be used with any style rocker cover

Installation Instructions

Manufacturer Part Number: 90-4925