Alright, my carbs were awful. The bike wouldn't idle right, wouldn't stay on, wouldn't take any throttle. It was terrible. And slightly embarrassing. A big hit to my masculinity. I stumbled onto a forum discussion over at ZX Forums (dot com) that mentioned heating your carbs in lemon juice would help dislodge any junk and/or rust that had built up. Some more research led me to vinegar. And if one combines the two ingredients with heat, it becomes a ridiculous super cleaner. So today I tried it, a liter of lemon juice ($3.00) and a liter of vinegar ($0.89) two liters of water, and a half teaspoon of salt. I stripped my carbs down to bare metal and boiled them for about 20 minutes. After reassembling everything, the bike started right up, held its idle, didn't need the choke on, and generally behaved like it should. So for five bucks and 20 minutes, I avoided having to rebuild my carbs (for now of course, eventually they'll need to be rejetted and all the fun stuff). A note of caution though: It will cause steel to rust, and stainless steel doesn't react well with lemon juice.