I also had 2 XT's and an SR, which I modified a bit. Same engine, basically.
The XT was was a great bike, IMO it was a kind of a legend. First Japanese big single, Yamaha took a chance and opened up a whole new market. Stone reliable.
Here's one of my XT's in South Africa at the start of an 800 mile road trip on Christmas day 1980 (girlfriend left me, and I was so pissed I left town for good - true story) and some pics of my modified SR which I still own.
and here's a TT500 (offroad cousin of the XT) I saw yesterday...
and here's the XT again after the first few hundred miles - crazy high handlebars (what the hell was I thinking), army sleeping bag as backrest, seat cut down to an inch or 2 which was also pretty stupid in hindsight.