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If you are trying to learn just maintenance things, you really don't need a spare motor to do that (including valve adjusts, it's not that hard). You can learn as you go on your bike, lots of people DIY these and there is a ton of information available (service manuals, and internet sites).
If you want to tear the whole thing down and build it back up again, that would be a pretty cool project. Whether it's worth $500 . . .
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