I am trying to remove the headlight from the fork brackets , however the bolts just spin inside the case. Just wondering if anyone has experienced this that can share with me how they removed them?

Umm... remove the headlamp lens/reflector and hold the nut that's on the inside with a wrench.

Yes agreed.....but I cannot remove that screw either......(of course)

I can grind the main head bolts off but was hoping that someone had advice for me before I went to that route.....

I’d attack the screw first Quartermaster as once bolts cut off there would be a headlight bucket hanging by the wires. It’s the big screw, small one is only to adjust beam
If you have a mig welder one method is place a small nut over screw head and weld in center of nut. Then use wrench and the heat sometimes helps loosen things. No welder - you’d have to drill screw head off.

Apologies if you've already tried, but any chance of being able to drill the retaining screw for the headlight rim? It will be pretty mild steel, and it's only the screw head that needs removing.

Alternatively, what screwdriver type have you been using and is there anything left in the screw head that you can get purchase on? The reason I ask is that Yamaha used JIS (Japanese Industrial Standards) screw heads, and Phillips screwdrivers can bugger these up. If there is some purchase left, buy a small set of JIS screwdrivers/socket heads and give these a go - you'd be surprised what a difference there is.

Thank you for the advice guys........

I ended up getting the screw to break free by beating the handle of the phillips head with hammer while turning.

(Fortunately, it didn't break the lense)

Ah...the old homemade impact wrench trick! (With apologies to Don Adams/Max Smart)