Leatherman or:
knife
pliers
file
wire cutters
small screw drivers
scissors
A pair of side cutters
Sockets 6,8,9,10,11,12,13,14,17mm + 3” extension, universal joint (1/4 or 3/8”)
Similar sizes as sockets in combo wrenches
30mm (if you are planning front sprocket changes)
Adj. Wrench 8”
Vise Grip 5”
6 in 1 Screwdriver
Spark Plug Socket (from OEM toolkit)
Metric Allen wrenches
Tire pressure gauge
Patch kit - fresh glue(!)
Spare tube(s)
Valve stem remover
Tire irons
24/22mm axle wrench
12v Air compressor (disassembled compressor from Wally World)
or bike pump
or CO2 cartridge pump
small can of talc and/or tire lube
Spare headlight bulb
Spare fuses
Electrical tape
Wire / alligator clips, wire nuts, connectors
Small multimeter
Wiring diagram (laminated sheet)
2 master links
Extra clutch cable
Small bag of misc nuts, bolts, screws
Spare fuel line (for siphon, repairs)
Extra quart of oil
Small can of WD40
Water - drink, wash, flush, etc
Sunscreen / hat / bandana
Small notebook and pen - to write down directions
Flashlight w/ batteries or mini-head lamp - hands free
Matches (waterproof)
Votive candle
Whistle
Compass
Sling to support arm in case of broken collarbone (common injury during spill)
Flare gun
A small first aid kit (space blanket, 1” adhesive bandages, 4×4 pads, alcohol and/or betadine pads, 1” cloth tape, roller gauze, bit of ladder splint or similar, water purification tablets, aspirin, etc.)
The experienced will do their own. The inexperienced can purchase tiny backpacking kits complete with instructions.
These are alternate lists I've discovered and mention here for reference.
In Motorcycle Touring by Gregory W. Frazier there is an list by Lee Klancher outlining the construction of a basic survival kit:
Portable bivvy/shelter
Waterproof match
Flashlight
Firestarter
Signal mirror
Police whistle
Parachute cord (50')
Aluminum foil (2, 36”x12”)
Insect repellent
Water purification tablets
The Pocket Survival Guide by J. Wayne Fears
Compass
Repair manual
Air pump
Tire pressure gauge
Cable ties, mixed
Misc. bolts, nuts, washers
Safety wire
Electrical wire (6 feet)
Duct tape
Electrical tape
JB quick weld
Goop household glue
Super glue
Various hose clamps
Heat patch kit (for tube tires)
Tire repair kit (for tubeless tires)
Spare tubes
Several pieces of inner tube
Lightweight battery jumper cables
Master link for chain
Fuses
Circuit tester (amps)
Oil filter
Clutch cable
Electrical parts known to fail on this motorcycle
Latex gloves (several pair)
Small tube of hand cleaner
In Motorcycle Touring by Gregory W. Frazier there is an list by Darwin Holmstrom with details on a first aid kit with some special items for motorcycles:
Several 30×30” unbleached muslin triangle bandages/slings
Small EMT shears or heavy duty scissors capable of cutting boot leather
Tampons or maxi-pads (for stemming flow of blood)
Imodium AD
Electrolyte tablets - prevent heat stroke
Ace bandage
Razor knife or scalpel