{"product_id":"s-s-cycle-breather-reed-valves-for-evolution-big-twin-93-99-part-no-31-2096","title":"S\u0026S CYCLE Breather Reed Valves for Evolution Big Twin '93-'99 – Part No. 31-2096","description":"Breather Reed Valves - Crankcase - Standard - Evolution Big Twin '93-'99\n\u003cp\u003eThe S\u0026amp;S CYCLE Breather Reed Valves (Part No. 31-2096) are designed to enhance the performance of your Evolution Big Twin engine from 1993 to 1999. Unlike traditional breathers that depend on crankshaft rotation to operate, these innovative reed valves open and close automatically based on pressure differentials within the engine. When crankcase pressure exceeds cam chest pressure, the reeds open to allow airflow; they close when pressures equalize, providing precise control of crankcase ventilation. This on-demand operation helps to optimize engine breathing, improves power output, and reduces high-rpm oil carryover, especially in engines with marginal piston ring seals. The design effectively compensates for lag time associated with airflow acceleration, contributing to smoother performance and engine longevity. Installation is straightforward, requiring no alignment of timing marks or rotating parts, making it an accessible upgrade for both professional mechanics and DIY enthusiasts. Made in the USA, these reed valves combine quality craftsmanship with ease of use, ensuring reliable operation and long-lasting performance for your Harley-Davidson Evolution Big Twin engine.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eAutomatic operation based on pressure differentials, eliminating dependence on crankshaft rotation\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eOptimizes airflow to improve engine performance and reduce oil carryover at high RPMs\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSimple installation without the need for aligning timing marks or rotating components\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned specifically for Evolution Big Twin engines from 1993 to 1999\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eMade in the USA with quality materials for durability\u003c\/li\u003e\u003c\/ul\u003e","brand":"S\u0026S CYCLE","offers":[{"title":"Default Title","offer_id":43032009015390,"sku":"09200008","price":161.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0012\/2545\/7758\/files\/12593.png?v=1784500122","url":"https:\/\/vtwinvisionary.com\/products\/s-s-cycle-breather-reed-valves-for-evolution-big-twin-93-99-part-no-31-2096","provider":"V-TwinVisionary","version":"1.0","type":"link"}