Weekendrider.....My position is purely a pragmatic one....I have just found that I seem to precipitate a hassle when I give the titling, registration or insurance companies more information than than fits or aids them in identifying the vehicle or in ways that it's not most likely listed in their reference records.
Let's take your photo for example....
of JYA5V4008DA1066660 That which seems to count and identify your bike best in the least amount of numbers are:
5V4 the model code and
106660 the engine & frame VIN # combined
are generally the combination which constitute what is most usually called the "VIN number for XS 650's.
To identify the bike best & easiest & simplest I would then go to the following pdf file
View attachment 25
There note that
5V4 & 106660 identify an XS 650 K Heritage which I would assume describes your bike. best, simplest and completely except for color
So in describing your bike to an authority I would call it for example a:
1983 Yamaha XS 650 K Heritage VIN # 5V4 106660 Simply put this is what I found just works best.
Because "JYA" probably just identifies where it was made by who and "5V4" is a known model code that fits with the series of VIN #'s that span your number on both frame and likely the engine (unless the OEM engine has been replaced).
I honestly don't know what the "oo8DA" describes, but it's a code for something or other outside
that which is usually included in a description of the VIN # in my opinion.
When you see two years listed like 1982 & 83, I've generally found the the first year describes when it was made and the second is most likely to be the model year of when it was most likely sold, title established and first registered but; I've seen that slip more than a bit.
The model code info. pdf link listed btw is the best I've been able to find so far. for what it's worth.
Any or all of this may be wrong but it's been working for me and others on a number of bike purchases both here, in New England and California.....so it's become the way I fly in describing these old beauty's especially across states, authorities and Insurance Co,s. Best, Blue