As Chris pointed out, stuff with which to fix a tyre. Put decent new tyres on before you go. Depending on where you drive and how you drive, most tyres will last you the trip you have in mind. If you need a new tyre on that trip, chances are good you'll need a few other things as well which you did not take with. So leave the spare tyre. If chain driven, like IDR said. Good map. Cash. Credit card for back up only. Passport and papers if you leave the country. Certified copies off all your documents, stored separately. Basic repair kit - spanners, screwdrivers, some bolts and nuts that match ones on the bike. Things tend to vibrate loose on a long trip. Cable ties. Good duck tape. Glue - Pratley is proven. Super glue. Bungee cords. You never know if you will need to strap something to the bike you did not plan for. Bloudraad en 'n goeie tang. Extra spark plugs. Extra oil with which to top up in the middle of nowhere until you can reach a fuelling station. A decent water container with water. Two sets of gloves. Wet wipes. Plenty of undies and socks. All the specialised tools needed (if any) to do the above mentioned work. Manual for the bike, in case somebody knows what to do, but don't know your particular bike. Know your fuel consumption and fill up regularly. Start early in the mornings. Try to call it a day at around 16h00. Always check everything before you start up for the day. Go through everything. Check the frame, pull on things for any play. Monitor oil seepages. Take regular brakes. Via con dios.