Yamaha Yamalube ACC-RNGFR-PL-12 Ring Free Plus Fuel Additive Genuine OEM Yamaha Part Exclusive, Synthetic PLUS Formula Provides Superior Deposit Control; Cleaning Fuel Injectors, Carburetors, Intake Valves, Intake Ports And Combustion Chambers Contains Metal Filmers To Help Protect Fuel System Components Like Silver Solder, Copper, Aluminum And Steel From The Corrosive Affects Of Ethanol Sulfate Salt