Cycleops,
You may wish to consider looking at single cylinder bikes as they are generally lighter than multi cylinder. The Honda Cb250rs (1979-83) is a brilliant lightweight bike at circa 136kg. I don’t know if they are available in your part of the world. A good Japanese cg125 is also a wonderful bike.
Pictured is my old Cb250rs, now replaced with an unrestored model in blue.
Also, my BMW g310gs single.
All the best.
Kev