I have never traveled with spare parts for my sport-touring days riding across the country, even a trip to Alaska and back for a month. Any trip for 5-7,000 miles i wouldn't even change oil until I got home. I learned to carry the essentials and minimal at that. First thing I learned as mentioned above was Duct Tape, and a side stand plate (in case of muddy campground). I would carry a flashlight, and the factory tool kit is all. I will list a brief list for my month trip to Alaska in August!!!
Packed Items: Camera, toothbrush, deodorant, Advil to start the day, 1 pair pants, 3 socks, 3 tshirts, 3 pr undies, sandles, 1 pr shorts, 1 pr long john style pant, cold gloves, 3 season glove, waterproof glove, extra visor, ten pairs ear-plugs, 1 fleece, small 2 person tent, sleeping bag, miniature cookset, mini lantern (fit inside cookset), bottle of fuel, Wallet and Cell phone, small can Honda Polish and wipe cloth, tire repair kit and tiny compressor, heated vest and control and misc snacks which wouldn't melt in sun-baked heat (jerky, nuts and hard candy)
Wearable items: Riding Boots, helmet, one of the gloves, one of the pants, shirt, socks, undies, Aerostich (no need for packing additional waterproof items), 80 oz Camelback on my back.
For s shorter trip, one can reduce the clothes part to 1 set wearing and one set of tshirts, socks and undies packed. I now use LD Comfort riding shorts, so this reduces my need to pack more than say 1 pair of undies. The LD shorts are hand washed each night in Hotel, or every other day, depending on if you can handle the odor!!! HAHA!!! My T-shirts are all now Micro fiber instead of cotton, lighter weight and packs smaller, same goes for my pants and shorts. I have given up using Jeans if possible, packs way too bulky!!!
These are just items I have used, others vary and have more or less with them.