A summary of what broke during our adventure:
broken shifter cable on the first day, leaking tire inner tube, broken roof rack welds, plugged fuel shutoff valve, numerous broken body welds, muffler bolt went missing, broken muffler tailpipe weld causing it to go missing, broken roof rack welds (again), maybe a bad spark plug and/or spark plug wire (changed them at the same time for good measure), fried/seized clutch, broken clutch key, and cracked clutch keyway, broken engine crossmember at weld
What went right? The whole experience. Even more so, whenever things seemed to take a turn for the worse, some comical moment would occur and we were right back in high spirits. Additionally, almost every time we had a breakdown, it occured at the most convenient location.
Notes to future self:
Don't expect to find anything in India in a hurry. If at all possible, bring what you want with you as you are entering the country. Even simple things like gum, bug spray, sun glasses, and that sort of thing are aggrevatingly hard to locate.
Don't expect anyone to understand you; even though English is one of India's official languages.
If you are at all mechanically inclined, bring an 8mm through 14mm combination wrench set and an 8mm through 14mm socket set. Besides the usual spark plug, plug wire, and fuel filter, buy a spare shifter cable, clutch cable, and throttle cable; at least one of those three are almost sure to break. Consider buying a clutch kit as well. Consider the cost, safety, and practicality of buying and hauling around a small oxy-acetylene welding kit if you have the knowledge and plan to spend a lot of time off of the beaten path. Broken control cables, worn out clutches, and broken welds seemed to be the most common causes of breakdown among all of the teams (besides the obvious and extremely common fuel, ignition, or tire related fault).
A lot of the small town roadside "mechanics" will try to sell you a carburetor or carburetor cleaning no matter how unrelated the symptoms. Clutch is stuck engaged? "Carburetor." Ignore them unless you are sure of the diagnosis.
Take the vehicle keys out and put them into your pocket whenever you leave the seat. Even if you are standing right next to the vehicle and are talking to someone, someone else is liable to jump in and try to take it for a spin. This is especially true when in close proximity to a "mechanic". It is in the mechanic's best interest -- under the guise of troubleshooting -- to break whatever turns out to be the weakest/most-damaged component.
Consider writing your country of origin (not just your flag or colors [we had a huge American flag flying and hardly a soul seemed to have any idea of our country of origin]), the city in India from which you started, your destination city in India, your name(s), "petrol", "two stroke", "not a taxi", "this vehicle on loan from www.theadventurists.com", and "this vehicle provided by www.theadventurists.com as part of a service package and I could not possibly guess the amount that I have paid solely to use this vehicle" onto a prominent location, on a handout, or even incorporated into your paint job, in Hindi, to alleviate answering the same questions over and over again.
And most importantly, whenever trash exits your auto rickshaw by its own volition, make sure you yell out "I'm saving the world!". This also works for fuel spills and whenever you get the nagging feeling that joyriding in a two stroke across India is wasteful.