If your bike's stator starts to fail (which you can see happening with the trusty voltmeter you've installed on your bike, right?....
), you can buy yourself some time to get to the nearest shop/dealer (or back home) by removing the fuse that handles the headlight.
This is the very top right fuse in the fuse panel (which is behind the bike's left side cover). You'll need a pair of needle-nosed pliers (or equivalent) to make this removal quick and easy. Having a set of these pliers on board is not a bad idea.
This bike is reliable enough (assuming it was properly treated by any previous owners--ha!) so that what's most likely to put you on foot is either a battery issue or a flat tire.
It's a "no-brainer" that periodically inspecting the battery terminals to make sure their connections are clean and tight will save you a lot
of problems later while on the road. Coating these terminals (and all other major electrical connections) after they've been cleaned with some dielectric grease will go a long way to keeping them clean over time.
If you install "Ride On" tire sealant in your tires, then your odds of having to stop to repair most flats goes way down. "Ride On" does its best job in tubeless tires, like ours. If you still have a flat with "Ride On" installed, it slows down the deflation process--another advantage of this sealant. So then your odds of a blowout are substantially reduced.
If you have not read any threads here on the "phantom gas syndrome", then you need to do a forum search for this, and read up on it. That's what's next most likely to give you real trouble while on the go. But I have found that it only occurs when (a) the fuel tank is below half full, and (b) the weather is really hot (July, August). Otherwise, the phantom gas syndrome should mostly leave you alone.
Thus, my main point here is that one of the other main things you should "carry" along is some really good tire sealant in your tires.
I've never understood why others feel a need to carry spare spark plugs. But I can recommend that you carry a spare headlight bulb (and the tools necessary to open the headlamp bucket to replace it)--especially if you haven't installed driving/aux lights on your bike.
If your bike is an older bike, carrying along a simple circuit tester to help find/troubleshoot wiring issues while on a longer ride might be a good idea, too. With this same train of thought, a few spare fuses (of different capacities like those already in the bike's fuse panel) in the tool kit might help out with an electrical issue, too.
I always carry a kickstand base plate with the bike, so if I am forced to park the bike on a soft surface (sand, or even hot asphalt) I can do so without the bike falling on its side after I walk away.
A spare bike key, carefully hidden, can save the day if you lose/misplace your bike's main key somehow.
Hope all this helps....