Well I haven't been able to find a YZ125G to buy as yet to relive the memories of my youth, however we just picked up this YZ80G to put aside as a long (long) term project to do with my son in a few years. I had one back in the day that my brother and I bought new ($749) and I still have the Heikki Mikkola clock that came with it.
This one's a non-runner and a bit ruff but should make a good start, so if you guys come across any parts or a service manual (paper or on CD) please let me know.
cheers
Woody
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Mike doesn't look too sure about the new project and probably rather a KTM?
The only pic we have of the old one;