Any reference to Right means 'right' as seen from sitting on the bike
NOT as you see it on the pictures
Any reference to Left means 'left' as seen from sitting on the bike
NOT as you see it on the pictures
The T-1 mark means the T mark on the crank
under witch you'll find a F and the number 1
This thread is for a 77 GL1000
What you need:
..a set of timing belts
part #14400-371-04/14400-371-14 for the early models
(later models 78-79 have different number ...mmmm???)
or alternatively Randakk suggests:
Gates #T274
NAPA #250274
Goodyear Gatorback #40274 (available at AutoZone and others)
..a 12 mm ring spanner with a decent 'offset' (more on that later)

...and maybe a set of 'tension rollers'
part # 14510-371-008
(they are about 60$ a piece (!!!))
Oh yeah; you need to remove the radiator...well not strictly,
but I wouldn't want to do this job without removing it...no way!
Remove front covers:

...remove spark plugs (you don't wonna turn the engine with the plugs in position.-)
...remove generator bolt cap

so you can get in there with your offset 12mm rings spanner.(This is where it needs to be offset)
This is the way the engine/crank will be turned during this procedure.
TURN CLOCKWISE ONLY!
You don't want to loosen that bolt.
...remove timing mark cap

turn engine as described above until the T-1 mark aligns with
engine block marks (it looks a little 'out' on the photo. It's the angle)
AND (this is important)
the pulley marks aligns with the marks on the engine cover
like here on LEFT side (seen from sitting on bike..remember)

and
RIGHT side
