fits  84-99 Evo Big Twin

High quality and M10x1 threaded. Easy electric starting of big and high compression motors. Push to activate and auto-close. With 5-7 Newton closing force, for high performance applications. Knobs are molded for ‘a cool touch’ and easy operation with a warm engine. KPMI brand embossed. A: M10x1 threaded. B: 1.400″ Overall length. C: Thread length 0.350″.

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Home > Parts > Engine > Top End > Compression Releases > KPMI, Evo compression release valve set

fits  99-17 Twin Cam style engines

High quality and M10x1 threaded. Easy electric starting of big and high compression motors. Push to activate and auto-close. With 5-7 Newton closing force, for high performance applications. Knobs are molded for ‘a cool touch’ and easy operation with a warm engine. KPMI brand embossed. A: M10x1 threaded. B: 1.730″ Overall length. C: Thread length 0.350″.

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Home > Parts > Engine > Top End > Compression Releases > KPMI, Twin Cam compression release valve set

fits  Various H-D models

High quality and M10x1 threaded. Easy electric starting of big and high compression motors. Push to activate and auto-close. With 5-7 Newton closing force, for high performance applications. Knobs are molded for ‘a cool touch’ and easy operation with a warm engine. KPMI brand embossed. A: M10x1 threaded. B: 1.750″ Overall length. C: Thread length 0.500″. Note: for 84-99 Evo B.T. see 569219. For 99-17 Twin Cam see 569220.

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Home > Parts > Engine > Top End > Compression Releases > KPMI, compression release valve set

fits  99-17 Twin Cam with S&S cylinder heads (NU)

Replacement part for 915195 S&S electric compression release kit.

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Home > Parts > Engine > Top End > Compression Releases > S&S, replacement silicone solenoid caps

fits  99-17 Twin Cam with S&S cylinder heads (NU)

Replacement part for 915195 S&S electric compression release kit.

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Home > Parts > Engine > Top End > Compression Releases > S&S, compression release assembly (electric)

fits  99-17 Twin Cam and S&S T-style engines with S&S heads and 915195 electric compression releases (NU)

Special 2-piece design compression release socket kit which allows you to install and remove 915195 S&S compression releases with engine mounted in the frame in most applications.

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Home > Parts > Engine > Top End > Compression Releases > S&S, compression release socket kit

fits  All Big Twin, XL Sportster and Buell XB models

10×1.0mm 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 (10×1.0mm) and 978424 drill fixture tool are separately available to aid installation in Twin Cams.

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Home > Parts > Engine > Top End > Compression Releases > JIMS, compression release valve set

fits  99-17 style T S&S heads (Twin Cam style)

Electrically operated. Large displacement / high compression Twin Cam motors with S&S cylinder heads can sometimes be troublesome to start. These electrical operated compression release valves are opened by two separate solenoids, when the starterbutton is activated. When starter button is released the release valves close. Note 1: Will only work with S&S Twin Cam style heads. OEM heads will not have enough material in critical areas to allow machining. Note 2: All 89cc S&S TC cylinder heads are machined at the S&S factory. Machining on the 79cc S&S TC heads is optional. Note 3: Will only work with S&S style rocker covers ‘with the central hole’ which provides the necessary clearance for the solenoids. Note 4: For replacement parts see 531408 (compression release assembly), 531407 (wiring harness) and 531422 (silicone solenoid caps).

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Home > Parts > Engine > Top End > Compression Releases > S&S, compression release kit for S&S T-style heads

fits  S&S cylinder heads with compression releases

Used to plug the hole when compression releases are not or no longer used. 9/16-20 threaded.

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Home > Parts > Engine > Top End > Compression Releases > S&S, compression release hole plug