Jims Big Twin Compression Release Valve - 727K

Upgrade your high-compression Harley-Davidson Big Twin engine with the Jims 10mm x 1.0mm manual compression release valves, engineered to significantly ease starting and reduce strain on your starter motor. These essential components allow you to temporarily lower the effective compression, making it much simpler for your engine to turn over, especially in big-inch, high-performance setups.

Description

Designed for motorcycle enthusiasts running powerful, high-compression Big Twin motors, these Jims manual compression release valves are a game-changer for starting reliability. By installing these 10mm x 1.0mm self-sealing valves directly into each cylinder head, you can manually relieve cylinder pressure during startup. This crucial function not only protects your starter from excessive wear and tear but also preserves your battery's life, ensuring a smoother, more consistent starting experience every time. Crafted with precision in the USA, these valves are built for durability and reliable performance, seamlessly integrating into your engine's existing architecture. Their straightforward, drill-and-tap installation process means you can enhance your motorcycle's starting capabilities without extensive modifications, making them a practical and effective upgrade for any Big Twin owner.

Features & Highlights

• Effortless Starting: Manually releases cylinder pressure, making it significantly easier to turn over high-compression, big-inch motorcycle engines.
• Reduces Starter Strain: Protects your starter motor and electrical system from excessive load, prolonging component lifespan and preventing costly repairs.
• Self-Sealing Design: Engineered for reliability, these valves provide a secure, leak-free seal once installed, maintaining optimal engine performance.
• Precision Engineering: Specifically designed with a 10 mm x 1.0 mm thread for precise fitment and effective compression relief in compatible cylinder heads.
• Broad Big Twin Compatibility: Confirmed to fit all Harley-Davidson Big Twin models, offering a wide range of application for performance upgrades.
• Proudly Made in the USA: Manufactured with high-quality materials and craftsmanship in the United States, ensuring exceptional durability and performance.

Technical Specifications

• Product Type: Manual Compression Release Valves
• Thread Size: 10 mm x 1.0 mm
• Fitment: All Harley-Davidson Big Twin models
• Country of Origin: USA

Important to Know

Installation of these compression release valves requires drilling and tapping each cylinder head. Necessary tools, including a drill bit and a 10 mm x 1.0 mm tap, are not included with this product and must be acquired separately.