Motorcycle riders and DIY mechanics, if you're needing to replace valve oil seals on your Yamaha, this 2-piece set might be just what you're looking for. These seals fit a bunch of Yamaha models including the SR 125 (99-00), TW 125 (99-01, 03), TW 200 (94), VP X-City 250 (07-13), XG Tricker 250 (05-10), YBR 250 (07-11), Majesty 250 series, X-MAX 250 (05-14), MT-03 660 (06-11), SZR 660 (95-97), and XT 660 (04-11, 14). The part number is 5H0121190000. Valve oil seals are important for preventing oil from leaking into the combustion chamber, which can cause smoking and poor performance. These are replacement parts, so always double-check compatibility with your specific bike model and year before ordering. Good for engine rebuilds, maintenance, or repairs. Keep your Yamaha running smoothly with these essential seals. A must-have for anyone working on their own bike!