Owners of the 2004 TT-R225 are working on a bike that Yamaha documented under part number LIT-11616-TT-26. The code to match is TTR225S. That one book was written to serve the whole run, so the 1999, 2000, 2001, 2002 and 2004 model years sit inside it, as do the TTR225 and the TTR225L.
What that means in practice: the procedures are the factory ones, written for a dealer service department rather than rewritten by a third party. Torque figures, clearances, disassembly order and the wiring as Yamaha drew it are all in there, and where a year differs from its neighbours the text calls the difference out rather than glossing over it.
Before you commit, compare LIT-11616-TT-26 with the number on any manual you already own, and confirm TTR225S against your machine. Those two identifiers are the only reliable way to be certain you are looking at the right reference for your bike.
