1. Start the engine to warm up the oil.
2. Turn off the engine and ensure the motorcycle is on level ground.
3. Place an oil pan under the oil drain bolt on the bottom of the engine.
4. Use a 17mm wrench to loosen and remove the oil drain bolt.
5. Allow the old oil to drain completely.
6. Replace the oil drain bolt and tighten it securely.
7. Locate the oil filter, which is on the right side of the engine, just above the oil drain plug.
8. Use an oil filter wrench to loosen and remove the oil filter.
9. Apply a thin coat of new oil to the gasket of the new oil filter.
10. Screw the new oil filter onto the engine and tighten it securely by hand.
11. Remove the oil fill plug, which is located on the right side of the engine, near the top.
12. Use a funnel to add new oil to the engine. The KZ650 takes 3.2 liters (3.4 quarts) of oil.
13. Check the oil level using the dipstick, which is located near the oil fill plug. The oil level should be between the "full" and "add" marks on the dipstick.
14. Replace the oil fill plug and tighten it securely.
15. Start the engine and let it run for a few minutes.
16. Turn off the engine and recheck the oil level to make sure it is still between the "full" and "add" marks on the dipstick.
