Evolution Industries EVO-1015-2073 Replacement Red Heavy Duty Clutch Springs for Big Twin 98-Up w/EVO-1006-4160/EVO-1006-4163

Stage-1 Replacement Coil Springs for Evolution Industries Clutches. Coil Springs offer more options for tunability over diaphragm spring style clutches. Fine Tune Clutch Performance with Spring Selection and spring shims. You can also replace worn out or damaged components to give an old clutch new life. Yellow Replacement Spring Set Up to 100HP –  Blue Replacement Spring Set Up to 150HP – Red Replacement Spring Set 155HP to 220HP.  If HP is close to the threshold, springs can be mixed 1/2 and 1/2 or 4 each of one and 2 of another to accommodate the HP of the bike.

Part Number 1015-2073 – Big Twin Only – Heavy Duty Red Replacement Spring Set (6).
Fits: Evolution Industries Stage-1 Clutch Kits (Big Twin). Used for High Output Engines (155HP to 220HP). Comes with retaining cups and bolts.