Kibblewhite 80-81700 - Kibblewhite Lightweight Racing Valve Spring Kit For Yamaha YXZ 1000 R 2019

Features: Compatible with boosted or turbocharged applications. Designed with increased spring rates and high lift compatibility compared to the stock springs. CNC-machined titanium or H.T. (Heat Treated) Steel retainers and Cr-Si (Chromium Silicon) alloy dual springs provide valvetrain control at high rpms with high-performance camshaft capability. Made in the USA. Recommend using shortened valve guides to achieve higher than stock lift..