A "good" set of tools, not the crap you get with the bike.
Duct tape and zip ties. If it can't get fixed with a lil' duct tape and a zip tie, you in a heap of trouble.
Rain suit, ball cap, sweater or jacket, long underwwear or sweat pants, for under your protective clothing for sudden temp changes due to alltitude or darkness.
A flashlight for roadside repairs in the dark, like replacing a blown fuse.
Fuses
Flares so you don't get run over whilst making said roadside repair in the dark.
A good knife.
A gun, in case the knife didn't convince 'em you was serious.
Water and some non-perishable food, like granola bars, for being stuck on the side of the road at night.
Sleeping bag, in case it becomes a really long night on the side of the road.
Bungee cords.
Frist aid kit.
Quart of oil.
Spare oil filter. In case it's a really, really long trip. Oil you can get almost anywhere.
Spare spark plug, and the tools to properly set the gap and install it.
SUNSCREEN
Sunglasses
Bandanna, a little water on it, tied around your neck will help cool you off in hot weather.
Map
Water-proof matches, coz you just never know.
Cell phone. Don't forget your charger!
Can' think of anything else at the moment. Have a great trip! And I'm serious about the sunscreen.
Ride safe,
Jay