First make sure you have oil filter KN-111 or equivilent; also depending on what the temperature is: 2.6 quarts of 10w40. Make sure engine is at proper temperature(10 minutes of stop and go riding). Remove Drain Plug and Oil Filter Housing. With Kill Switch on cycle engine for 3-5 seconds to remove all oil. *Do not cycle over 10 seconds or engine damage will occur* Make sure seals and bypass plug are in good condition. Lightly oil seals before continueing. Tighten Oil Bolt to 13-18 ft-lbs. Capacity: 2.6 quarts. To check oil: unscrew Dip Stick wipe off and replace without screwing. Oil Level should be in crosshatch.