After not having a street motorcycle for a few years, in 1995 I bought a used- excellent/clean/mint condition '83 GS1100ES.
It was an awesome bike, I bought it in FL, and my wife and I often took long backroad rides in the country there on it.
I moved back to TX, and rode it there too. It was never crashed.
Mine also came to me with a really nice, color matched Corbin saddle to get rid of the ugly black/stock one too!
My only time I've ever ran a true 1/4 was on that bike.
It was completely stock, with stock dual 2 into 1 dual pipes.
I made sure I had the right gear, passed a simple inspection, and ran 3 passes at the TX track.
Before my first pass, I rolled up on another GS1100- full drag only bike and talked with the owner/rider and got some pointers- like pop the clutch on the last yellow light for a good reaction time.
I didn't save my run sheets- but I remember each pass was in the high 11's, at 116mph for the 1/4 mile.
I had a lot of fun that night on my completely stock GS1100ES that was at least 15yrs old by then.
I sold it around yr 2000- it ran well, but needed a new battery, and fork seals- still looked and ran great.
I loved the color scheme, and my former '97 GSXR750 was a similar color scheme.
My current K5 R1000 is similar also- I wish it had more of the light blue instead of that darker blue it has- but oh well.
Here's an excellent article with comparisons in it on the '83 GS1100ES