I was a professional mechanic for over ten years, a machinist for ten, and am currently doing wood pellet boiler repair. I've done all maintenance and repairs for my own vehicles since I was old enough to ride a dirt bike. I've used a few tools.
I'm not a tool snob. Even for professional use different tools require different qualities. Most of my hammers came from cheap discount stores. Some I've had for twenty years without failure. Sockets are a tossup. Craftsman are OK, I would skip most of the really cheap stuff (the ones that are made so poorly the socket sizes often can't even be read when new). They will fit poorly and will fail easily. For my personal tools I have a variety but most are very good quality, and very expensive. For the work van I have cheaper stuff because they tend to get damaged a lot, or left at job sites. Not to mention other workers grabbing the tools. Here is a list I would suggest:
Ratchets- Buy the best you can afford. For a bike emergency tool kit, Husky from Home Depot would work well. I'm not a fan of Craftsman- they failed easily back when they had a quality company manufacturing them; now that they have declined in quality, forget it.
Sockets- Hit up a Harbor Freight. Look for the colored sets (individual colors for the sockets). They are very cheap and hold up very well. I use them for boiler repair every day and they work fine. I wouldn't use them for professional mechanic work, but they will be a good addition for a tool kit. Husky from Home Depot are pretty good as well.
http://www.harborfreight.com/10-pie...c-deep-wall-color-coded-socket-set-93265.html
http://www.harborfreight.com/21-pc-38-in-drive-sae-metric-high-visibility-socket-set-67900.html
Pliers/cutters: Skip the extremely cheap stuff. Craftsman are still pretty good I think. I use Husky at work and they work well. Husky locking pliers work pretty well too. I like the real "Vise-grip" brand for heavier use.
http://www.homedepot.com/p/Husky-6-in-Long-Nose-Pliers-48058/203287743
Screw drivers- I don't skimp here. Our fasteners strip out very easily. Order a set of JIS drivers. A Husky flat blade to go with them.
Electrical- skip the cheap wire strippers/crimpers. Most are junk. Get a set of Klein from Home Depot.
http://www.homedepot.com/s/klein%20wire%20stripper?NCNI-5
For an emergency tool kit for a motorcycle look for ways to re-purpose tools. An adjustable wrench can be used as a hammer. A flat screwdriver can be used to pry with or as a pinch or chisel.
Walk around lots of tool stores and feel the tools. Use your judgement for quality. See how different brand tools feel in your hands- that will tell you a lot.