KZ1000 - what year did they go tubeless?

I have purchased a 1980 KZ1000 B4 and was wondering if this was they year they started tubeless tires? No manual, and similar markings on the wheel as the 1979 - known tube type.

Are the tubeless wheels marked as such?

Any help from the experts appreciated;)

It will either say TL or tubeless on the wheel near the DOT stuff on one of the cast spokes.

79 KZ1000E model "ST" was tubeless. First KZ1000 to be so. The rest of the KZ1000 was 1981 when the J came out on cast wheels. 1980 LTD used tube type wheels. The LTD was always 1 to 2 yr behind in any upgrade at least, so it's entirely possible they were still tube till 1983.

Thanks!

Was hoping to shed the tubes, but I doubt I have any reason to...