[bobcowan]

For flat repairs, check with any good motorcycle supplier. There are a number of good plug kits available.

I have a small 12V air compressor I bought at WallyWorld for about $12. Remove everything that doesn't look like an air compressor (all the plastic bits), and you end up with a pretty small package.

As for tools, carry the basic stuff you already know about. Use that tool kit to do basic maint and small repairs in the garage. Then you'll know what tools - exactly - that you'll need for roadside repairs. Don't forget baling wire, duct tape, and some zip ties.

Mallory and MSD distributers are pretty famous for breaking down; modules, caps, rotors, and shear pins. I can spares, and the tools to replace those parts all the time. A set of ignition cable ends is a good idea, too. Sometimes you burn a boot and need a replacement.