Jims Manual Compression Release Valves

Features

• 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
• 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 x 1.0mm drilled and tapped hole in your cylinder head for use