I try to keep all of the tools on my bike that I need to do small repairs. The only way to figure out what those tools are it to take something apart (clean battery cables, clutch and throttle cables, remove exhaust for neighbors, etc). All of the tools that you needed to do it should go into your bag.
2012 High Ball, changing all the time. "OOPS I bought another Wide Glide"
"The difference between stupidity and genius is that genius has its limits." Albert Einstein