S&S Cycle 31-2096 Breather Reed Valves — Harley-Davidson Evolution Big Twin 1993–1999

S&S Cycle 31-2096 Breather Reed Valves — Evo Big Twin 1993–1999

Upgrade your crankcase ventilation with the S&S Cycle 31-2096 Breather Reed Valves, engineered specifically for Harley-Davidson Evolution Big Twin engines from 1993 to 1999. Unlike traditional rotation-dependent breathers, these pressure-differential reed valves open automatically when crankcase pressure exceeds cam chest pressure and close when pressures equalize — delivering on-demand airflow that keeps up with your engine at any RPM. Made in the USA, they install quickly with no timing mark alignment required.

• Pressure-differential operation — opens on demand, no crankshaft rotation dependency
• Automatically compensates for lag during high-RPM operation
• Reduces high-RPM oil carryover in engines with marginal piston ring seals
• No timing mark alignment or rotating parts required for installation
• Improves airflow, reduces oil consumption, and supports smooth operation across the rev range
• Made in the USA by S&S Cycle

Specifications

• Part Number: 31-2096
• SKU: 31-2096
• Brand: S&S Cycle
• Weight: 0.21 lbs
• Country of Manufacture: USA
• Compatibility: Harley-Davidson Evolution Big Twin, 1993–1999