Actually , the Nakedgoldwing forum has discussed this at length .
I am only familiar with the GL1000 , but in that case , you can get at the timing belt covers without removing the radiator .
Drain the coolant , remove the lower hose flange from the block , remove the 2 lower radiator mount bolts , loosen the 2 top mount bolts . Now you can get at the bolts that hold the covers on .
( 2 bolts each ) A 10 mm short socket and 1/4" air rachet really helps .
If you have crash bars , you may have to loosen or remove them , especially on the right side , to get the cover to slide out .
Take plenty of digital photos before you start taking the belts off.
Unless you take off the valve covers ,and back off the valve adjusters , the cam wheel will jump off the marks as soom as you remove the belt .
Follow the procedure in Tech Tips .
The left belt will go on and line up pretty easy. The right belt will never quite line up exactly on the mark . When you get it to look like it's off 1/2 a tooth ABOVE the mark , then you have it all set .
Remember , this is only true on my 77 GL1000.
your experience may be different .