I had problems with mine this fall (96' zx6r), but was finally able to get it off with a a large 27 mm socket on a 1/2 inch drive with a 3 foot pipe on the ratchet drive. Instead of using the brake and tranny, I put another pipe through the rear wheel and over/under the swingarm (wrapped in cloth of course) to hold the rear wheel in place. Lots of leverage and it finally let go. Be careful, when it goes it goes!!
Funny this should come up today. I just brought my bike back from the shop about two hours ago. I got new sprockets and chain. They nearly couldn't get the front sprocket off, he told me that it's a common problem with the Kawasakis. Anyway, after lots of work, they finally got it off.
I would definatly recommend that you take yours to the shop to get that stuff done.
I don't see any reason to take it to the shop to loosen the front sprocket. It is torqued on there pretty good, but if you give it a little elbow grease, and put something in the rear wheel to keep it from turning like DavidE said, you shouldn't have too much of a problem.
I also re-used the washer that bends over the sprocket nut. Just bend it in a different place and you can use it a few times before buying a new one.
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