For use on standard motor sizes
with some performance upgrades. Use with supplied
spring. Initial spring pressure is 190lbs on Evo &
1200 Sportster and 150lbs on 883 Sportster. About
35% reduction in spring pressure from stock. Evo kit
requires special clutch tool for install. 1991 to
1993 Sportster must use 1994 and later primary cover
due to clearance issue.