The pump running off cylinder air is a nice way , I have one , but unfortunately it does not work on single cylinder bikes without a kickstarter ( kill the battery ) and the bikes with high power electronic ignition are not suitable because you may damage the electronics by running them with a sparkplug lead disconnected and not grounded properly (BMW). Also the electrocution hazard to worry about.
Then there is the problem of easy access to any of the sparkplugs in the tightly packaged engine arrangements which may require removal of the tank or other bits- more work, not good if you are stuck off somewhere in the dark on a strange road or trail.
Don't know about South America but in Central America I've seen TipTop tire repair products advertised at shops so I imagine they may carry the CO2 cartridges. Your best bet is to carry a good old fashioned hand pump, or buy one when you reach SA
Last edited by Sjoerd Bakker; 3 May 2008 at 18:57.