JIMS - Compression Release Valve KitsGive 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 installed 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.
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