I've seen several posts on tools needed to work on the Zero. I would recommend a standard wrench and socket set including socket allen head and torx wrench sets. However I was thinking, what don't I need to work on this bike. Let's see, oil filter wrench, spark plug wrench, feeler gauges (anyone remember these?), chain tool, oil drain pan (and receptacles for the oil). What else, transmission fluid, chain oil, clutch oil. Carb tools. What about a timing light? (not every modern motorcycle has fuel injection and a computer control module. My 2014 Suzuki DL650 is using state of the art 1996 technology. Despite the hype for high tech ADV bikes many around the world travelers recommend getting the most simplest ICE bike you can find so you can fix it in Bolivia.)
Anything I forgot?
It many ways working on the Zero is like working on a bicycle (except that a voltmeter might be needed). As an ex-bicycle mechanic I've always enjoyed working on bicycles due to the fact they are cleaner and simpler machines. However bicycles take many specialized tools to work on them (cassette remover, crank remover, pedal wrenches, headset wrenches, cable stretcher, third hand, etc). It appears Zero might have leap frogged the bicycle industry in some ways. My next commuter bicycle will probably have a Gates belt drive and internal geared hub. There are even CVT hubs out there for bicycles.