Intake and exhaust valve guides for the Yamaha 998 engine platform that includes the YXZ SxS and SideWinder, Nytro, Viper and Vector sleds. BC premium valves guides are made from Manganese Silicon Aluminum Bronze alloy and CNC machined to exacting tolerances. BC guides are resistant to cracking and corrosion, while reducing friction and insures high lubrication even at elevated engine temperatures and rpm's. The perfect replacement to worn or damaged guides and 100% compatible with BC's lineup of stainless steel valves. Set/12