Kawasaki PN 11061-1155: Gasket, Pulsing. You know it as the pulse cover gasket, and if you're doing your valve adjusts "by the book", you need to remove the pulse cover to line up timing marks appropriately. This is a paper gasket and often will not survive the cover removal process.
Get yourself prepared ahead of time and have one of these on hand. Buy two and save a couple bucks, and be ready for the next time around as well!
Pulse Cover Gasket Options: