By This guide has been taken from R1-Forum.com, the original is here: https://www.r1-forum.com/threads/how-to-04-06-r1-replace-stator-generator.212187/ I have taken the guide and pictures and remade it here with some edits to wording and image presentation to preserve this information for anyone in the future that may be affected and may not be able to
Yamaha R1 Charging System Rotor Magnet Failure
The 2004 onwards R1 and FZ1 model had issues with the charging system rotor magnets breaking off the epoxy and completely destroying the stator and sending metal particles all through the oil. It isn’t an “if” it’s a “when” it’ll happen as the epoxy gets brittle over heat cycles. They