S&s Cycle Breather Valve - 31-2100 For Harley Motorcycles 1993-2000 Handlebars GEN 300 Series are brighter

GEN 300 Series are brighter with a wide viewing angle

The Machine Cut end cap enhances the visual appeal and adds a striking style to your motorcycle setup

550" INTAKE DURATION 216° EXHAUST LIFT 0

Do not fit 2024 to present Touring models

'99-'07 FXST

S&s Cycle Breather Valve - 31-2100 For Harley Motorcycles 1993-2000 Handlebars GEN 300 Series are brighterFeatures New style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, reeds open when pressure in the crankcase becomes greater than pressure in the cam chest, and close when pressure in the cam chest is equal to or greater than pressure in the crankcase By opening and closing "on demand," the reed valves automatically compensate for lag time associated with accelerating the mass of air as it is forced out