All of a sudden, all of the on-line parts sellers are no longer cross-referencing all of their parts. In other words, when you find a part number, sometimes they no longer tell you what other years and models it fits.

Here's an example. Guide stopper, part # 447-12220-00-00. Used on all models from 1974-1983. Found on the Camshaft and Cam Chain diagram Look it up any way you want, and they won't cross reference it.
Hell, go to their on-line part finder look-up -- you use it when you already the know the part number -- enter 447-12220-00-00, and your search will come back "no parts found."
Tell me I'm not doing it right.
The only on-line seller that has it's act together is CMS:
https://www.cmsnl.com/yamaha-motorcycle_model16707/
All the other sellers seem to share the same crapola software, whereas CSM has it's own. And CSM has way fewer part number errors.
You have to sign up and log in to get the full cross reference list for a part, and there is usually a bit of scrolling around before you get where you want, but this is now my part number authority.

Here's an example. Guide stopper, part # 447-12220-00-00. Used on all models from 1974-1983. Found on the Camshaft and Cam Chain diagram Look it up any way you want, and they won't cross reference it.
Hell, go to their on-line part finder look-up -- you use it when you already the know the part number -- enter 447-12220-00-00, and your search will come back "no parts found."
Tell me I'm not doing it right.
The only on-line seller that has it's act together is CMS:
https://www.cmsnl.com/yamaha-motorcycle_model16707/
All the other sellers seem to share the same crapola software, whereas CSM has it's own. And CSM has way fewer part number errors.
You have to sign up and log in to get the full cross reference list for a part, and there is usually a bit of scrolling around before you get where you want, but this is now my part number authority.