749045 OEM Style M10X1 with 475 12MM Reach 1 250 32MM Long

These AV&V compression release valves provide a practical solution for starting high-displacement Harley-Davidson motorcycles. This specific variant features a shorter thread section, which minimizes the depth of machining required in the cylinder heads compared to standard OEM-style valves. Each unit uses an M10x1 thread and includes a heat-resistant charcoal knob that complements various engine finishes. These valves allow riders to manually release cylinder pressure, protecting the starting system from the high resistance of performance engine builds. AV&V focuses on durable materials that withstand the intense heat cycles of air-cooled engines. Sold as a pair.