{"product_id":"s-s-cycle-breather-reed-valves-for-evolution-big-twin-1993-1999-0-030-oversize-part-number-31-2100","title":"S\u0026S CYCLE Breather Reed Valves for Evolution Big Twin 1993-1999, +0.030\" Oversize – Part Number 31-2100","description":"Breather Reed Valves - Crankcase - +0.030\" Oversize - Evolution Big Twin '93-'99\n\u003cp\u003eEnhance your Harley-Davidson Evolution Big Twin engine with the S\u0026amp;S CYCLE Breather Reed Valves (Part Number 31-2100). Designed for models from 1993 to 1999, these valves feature a modern design that eliminates reliance on crankshaft rotation to operate. Instead, the reeds open when crankcase pressure exceeds cam chest pressure and close when the pressures equalize, providing on-demand operation for improved engine efficiency. This automatic adjustment helps compensate for lag in airflow during acceleration, resulting in increased performance and reduced high-rpm oil carryover, especially in engines with marginal piston ring sealing.\u003cbr\u003eInstallation is straightforward with no need for aligning timing marks or rotating parts, making it a convenient upgrade for mechanics and enthusiasts alike. Made in the USA, these reed valves are crafted with precision to ensure durability and optimal function in demanding riding conditions. The oversize +0.030-inch version ensures a precise fit and enhanced airflow management, contributing to smoother engine operation and longevity.\u003cbr\u003eWhether you're restoring a vintage Harley or boosting the performance of your existing engine, the S\u0026amp;S CYCLE breather reed valves provide a reliable, high-quality solution. Designed to meet the rigorous demands of big twin engines, they help maintain proper crankcase ventilation, reduce oil contamination, and support overall engine health. Trust S\u0026amp;S CYCLE’s commitment to craftsmanship and performance with this essential upgrade for your Harley-Davidson Evolution engine.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eAdvanced on-demand reed operation that opens when crankcase pressure is higher than cam chest pressure\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned specifically for Harley-Davidson Evolution Big Twin engines from 1993 to 1999\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eOversize +0.030-inch for enhanced airflow and performance\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eEasy installation without the need for timing mark alignment or rotating parts\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eMade in the USA with high-quality materials for durability and reliability\u003c\/li\u003e\u003c\/ul\u003e","brand":"S\u0026S CYCLE","offers":[{"title":"Default Title","offer_id":43031953735774,"sku":"09200009","price":167.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/2545\/7758\/files\/12594.png?v=1784497522","url":"https:\/\/vtwinvisionary.com\/products\/s-s-cycle-breather-reed-valves-for-evolution-big-twin-1993-1999-0-030-oversize-part-number-31-2100","provider":"V-TwinVisionary","version":"1.0","type":"link"}