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About S&S Cycle Compression Release

S&S Cycle Compression Release

  • 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.

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