The only real, necessary, emergency part would be an oil filter. It's unlikely, but possible you could spring a leak from a nasty rock or bit of scrap metal. And of course it would only happen in the middle of nowhere.
Steelheart- '03 Speedmaster Black/Yellow
The Hayabusa Killa
16" Shorties/140 mains/Airbox drilled
Procom CDI
"There is no cure for Celibacy. But we can treat the symptoms."