2003-2009 YAMAHA YZ450F Psychic Exhaust Valve Kit XU-09524EK

2003-2009 YAMAHA YZ450F Psychic Exhaust Valve Kit XU-09524EK

KIT FEATURES:

• All kits sold with valve, spring, retainer, seat to do a complete replacement of either intake or exhaust side
• All components are manufactured under iso 9001 certified factories
• Nitride coated components to improve heat transfer & carbon buildup for increased valve train life

VALVE FEATURES:

• Forged one-piece construction to help with weight reduction & improved flow
• Performance valves receive a swirl polish, smooth stem treatment, and are made of 21-2n/suh35ht stainless steel

SPRING FEATURES:

• Springs are made of swosc-v material (oil-tempered steel wire)
• Some springs feature a progressive style design with more coils on one end of the spring
• Progressive springs are heavier on one end and should always be installed towards the bottom
• Non-progressive springs are paint marked and should be installed towards the top

SEATS & RETAINERS:

• Made from 4041 steel (select applications use 707546 aluminum)
• Designed to work with psychic stainless steel valves and springs