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JIMS, compression release valve set

10x1.0mm threaded mechanical compression release valves, for most cylinder heads. Push-in the button and pressure will vent out of the valve. When the engine starts, the valves automatically close. Designedl for hard starting high compression motors. Note: MCS 978425 thread tap tool (10x1.0mm) and 978424 drill fixture tool are separately available to aid installation in Twin Cams.

Fits: > All Big Twin, XL Sportster and Buell XB models

Fits: >

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