JIMS Manual Compression Release Valves — Primary starter, Pair, Silver

🔧 Manual Compression Release Valves make starting high-compression engines easier by temporarily reducing cylinder pressure. Simply drill and tap each cylinder head (10 mm x 1.0 mm) and thread in the self-sealing release valves. Give your starter a hand by installing these in your high-compression, big-inch motor for smoother, safer starts. Fits all Big Twin models. 🇺🇸

Features

• Simply drill and tap (10 mm x 1.0 mm) each cylinder head and thread in the self-sealing release valves
• Give your starter a hand by installing these in your high-compression, big-inch motor
• Fits all Big Twin models
• Made in the USA