Normal
I am about to start the same journey as you. I inherited a '83 gl1100 interstate trike. It was not in perfect condition when my wife's uncle parked it. It has sat for 10 years. Carbs are definitely getting some time on the bench. I was also thinking timing belts. They have sat in the same position for 10 years and I read somewhere that the 1100 is an interference motor so don't want to eat any valves from a belt break. Going to get a cheap Amazon bore scope on look inside the cylinders to check them out. I put a little mystery oil in the plug holes and turned the motor over a few times. Then put plugs back in. Turned over and seems to have compression. Lots of work before I try to start it.