MFG Part Number: 004.491
Mikuni Main Jet N100.606 #155KIT FEATURES:
All kits sold with valve, spring, retainer, seat to do complete replacement of either intake or exhaust side
All components are manufactured under iso 9001 certified factories
Nitride coated components to improve heat transer & 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 fearture 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
