A while back a inmate here purchased a TA from another local inmate, of course it was advertised as "excellent, well maintained condition".
After the purchase he rode the bike directly to me to leave for service updating etc. The first thing I did before he left my shop was check the oil level, there was none on the oil stick and hardly any when the stick was screwed in. I have seen more than a few Transalps with low oil, knowing how to correctly check the oil level seems to be part of the problem.
Here is a view of what all needs to stay clean and be well oiled.
This good engine was ruined by someone who welded on the counter shaft sprocket which had to be cut off.
Once the counter shaft sprocket was removed the reason for welding it on was revealed. The splines are damaged due most likely to over a tightened chain, another common error that I have seen far more than you would think.