Motorcycle Honda GL650 Silverwing 1983 transmission fluid change?

How to change the transmission fluid - Honda GL650 SilverWing 1983 manual transmission? What type of transmission fluid, now much, etc?

The fluid is oil and there should be a dipstick to show the amount in there.
(not a Honda expert) So start with 2 quarts/ 2,5 liters, look at the dipstick and add a little, look again, add more and more if needed.

Best to have a Shop Manual when doing shop work or rely on a Yamaha rider to give you the basics. Close but a different cigar.

Thhe 'transmission fluid' is the engine oil. Remove the drainplug and filter. Should say by the dipstic how many cc's of oil, usually under 4 quarts.