The R&D Pro Stock Titanium Retainer Kit offers an economical solution to gain a smoother and more precise valve train by reducing retainer weight which will reduce the possibility of valve float. The R&D Titanium Retainer replaces the vulnerable and known to break stock Yamaha O.E.M. steel retainer with race proven titanium. The R&D Trust the pro’s at R&D with all your Camshaft and Valve Train upgrades. NOTE: R&D strongly suggests the installation and use of Titanium retainers where RPM range is above 8500. If you are not competing in the stock class, R&D also offers Super Single and Dual valve spring/retainer kit upgrades which offer increased valve control over the stock spring. The R&D Trust the pro’s at R&D with all your Camshaft and Valve Train upgrades.