I carry a fair amount of tools and spare parts due to past experiences.
1. Spare spark plug (had one fail internally 12 miles from home-did I mention I hate pedalling)
2. Spare chain
3. Spare derailleur (a misshift with a shifter kit bike can ruin a derailleur and bend the chain)
4. spare CDI and magneto (had both fail at separate times)
5. Spare intake gaskets (had one blow on last 100+ mile ride causing engine to run very lean and overheat
6. Tools-various to perform most maintenance but especailly tighten up drive chain on shift kit
7. Spare nuts/bolts (had mufflers fall off, studs break,e tc...etc..l)
8. Spare needle valve and e-clip for carb. lost an e-clip once when carb needle valve fell off)
9. 2 oz of degummed virgin press castor oil: perfect to premix with fuel if topping off at gas tank
10. army downed aviator mine flare and mini flare gun. I often ride in the mountains in the middle of nowere out of cell phone range.
11. High calorie survival bar and water filtration device (see no. 10 for reason)
12. Emergency blanket and emergency sleeping bag - only on long mountain rides.
13. Small propane powered solder iron, with small amount of solder (had wires at magneto fail due to bad solder and vibration...usally I fix during builds but carry with me anyway)