The 6800 was made from '89-91, with no change to any parts that I know of.
On the tag that is riveted to the right side frame, there is a serial #with a "P" or "N" on it.
Can't remember at the moment what they stood for-one was for 89 one for 91, etc.
Look thru the older posts, and there may be a discussion of this in an older thread.
Rattosh51
YT6800