JIMS - Compression Release Valve Kits

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Give your starter a hand by installing these in your high-compression, big-inch motor. These need to be installed by an experienced mechanic/machinist.Specifications Can be install ed in all Big Twin, XL and Buell motors Fits dual-plug heads or heads that have been machined for dual plugs Requires a 10mm × 1.0mm drilled and tapped hole in your cylinder head for use. Made in USA. Show more