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So today was the day I was going to fix my ZX6. I had all the fairing parts, and started up at 9. First problem was that, as I should have known, the upper fairing bracket was bent. I managed to bend it back enough to get the fairing on, but I really do need to find the part soon, it doesn't fit quite right still. Regardless, had the bike back together around noon and spun it around the parking lot. Seemed fine, so I took it on the road, and noticed that at about 6k in first the bike started bucking and hesitating with more throttle roll-on. Second gear was a mess, I couldn't even hit 3k. Basically, it looks like whenever I hit around 25-30 mph the throttle causes hesitation. If I roll steady on the throttle through the hesitation they smooth out a bit around 9k in first, but they're still there.
So I brought it back, yanked the fuel tank, and opened up the airbox. Some oil in there, I guess that shouldn't be a surprise since the bike was upside down. Cleaned out the oil, pulled the spark plugs and found oil in the two leftmost plugs and on the wires also. Cleaned the plugs, put them back in, checked the ram air intakes, bike back together. No dice, still hesitation.
By this point, I'm pretty much out of daylight so I called it a day. Next chance I get, I'm going to check the crankcase ventilation hose, maybe there's a kink or something in it. Failing that, any other suggestions for what might be causing this? Could my carbs be gummed up somehow from when the bike was upside down? Any other issues I should look into? I'll spend another half a day poking around, then the bike goes to a mechanic.
Oh well, at least the new tires came for the EX. Once I get them spooned on I'll be a bit more patient about getting the ZX running...