There has been some great feedback.
Based on what the forumites are saying, I have broken down the tool list into tiers. I've tried to group the tiers so that they pair up with an individual's "repair confidence."
Tier 1--Must Haves
- Cellphone
- Cellphone charger
- Credit card
- Some cash
- Towing plan*
- Good multi-tool (This isn't necessarily kept on the bike, and is helpful in many phases of life.)
*I get my towing plan through the company that furnishes my motorcycle insurance.
Tier 2--Really Should Have
- Tire pressure gage
- Tire patch kit
- Tire inflator (the smaller the better)
- Small flashlight
- Jumper cables
- Complete set of replacement fuses
- Gas siphon tube
- (edited to add) Cargo straps
Tier 3--Good Idea to Have
- Duck (duct, gaffer, 100mph) tape**
- Electrical tape***
- Zip-ties of various sizes
- WD-40
- Digital multi-meter
- Locking pliers (like a Vice-GripTM)
**Possibly rolled around a dowel or something else small to reduce volume.
***Possibly wrapped around wrench handles to reduce volume.
Tier 4--Probably Won't Ever Need, But You'll Be Glad You Have
- Front axel removing tool, adapter, thing
- Wires with alligator clips
- Replacement fasteners (windscreen, nuts, screws, clips, etc.)
Tier 5--Nice to Have
So far, this tier lists upgraded versions of the tools in the standard kit.
- Quality combination wrenches****
- Driver with bit selection (standard, Phillips, Allen, TORX)
- Ball-end Allen keys****
- Quality 3/8" ratchet wrench
- 3/8" 6 point Sockets (Do not use 12 point sockets)****
- 3/8" "Wobble" extension
****Same sizes as the ones in the kit
Of course
altercations arguments suggestions (additions, deletions, changes) to tiers are welcome.
Can anyone post specifcs (sizes, types, etc) of the fasteners listed in Tier 4? It would be nice to have a list of the common fasteners so one could shop ahead.
As a side note, I posed this question to my Harley riding co-workers, and, unanimously, haven't given additional tools a second thought.