If you want the most for your money and can't preform maintenance wait for winter rates. Usually Nov Dec are the best times for discounts. Where I used to work it was 20% off labor, tires and parts at times in the winter. Or find a trusted independent shop or a mechanical friend, then it's just beer and pizza. Many of the Ninja 300 guys mentioned paying $3-400 for valve maintenance and for most the first ,was just a check. Rarely needed adjusting. Some stating it didn't need adjusting untill 20k miles. But the Ninja is a weekend race bike with a 13000+ redline. Constantly running the bike at redline and the possibility of the bike being raced is most likely the reason for the earlier valve checks. Kawi is just covering their butts. The shim under bucket is a very robust, high performance design.