A cell phone. And let someone know where you're going so you have a backup rescue person who can bring you what you need or pick you and the bike up. A spare rear wheel, tube, tools, chain links, gas line, cables, etc. spare motor gets kind of heavy in the back pack. Randomness covers a large area including personal health and accidents. That's why such a trip is an adventure... venturing out into world of possibility.What about engine failure from randomness?
What could you bring as a backup measure? I know i got pedals, but besides that?
(keep in mind it would have to fit in a backpack)