I got around to putting on a 43T Renthal rear sprocket 210U-520-43P-HA after sorting out the strangled flat spot in the carbs, thanks to Kelly and others. I had put a 15T front on last fall, but the poor running down low made taller gearing seem not the way to go until that was solved.
Now that the bike is running flawlessly, probably like it *should* have come from the factory, the 43T rear went on today and the taller gearing makes the little Ninja start to feel like larger (more normal) bike gearing to me. I probably could even have gone to a 41T and been even happier, but this it for a while it for a while.
Pulling the rear nuts, axle, and countershaft nut is a really good excuse to buy a cheap HF electric impact wrench and reduces coaxing nuts to a 2 second battle.
Thanks to everyone for the info on the forum.
