24-03-12, 10:22 PM
The O ring is 2.5mm dia section and 27mm inside dia. You might get one from a car accessory shop. They usually have a box with a large selection of sizes in it and will probably charge from 10 pence to 50 pence. If they don't have the exact size but have a larger one with 2.5mm section, you can cut the appropriate length out (with a razor blade) and glue the ends together with super glue. I certainly wouldn't pay the Yamaha price :eek for a simple O ring.