• Gather your tools and materials. You will need:
o New primary chaincase oil (recommended weight: SAE 20W-50)
o Drain pan
o Funnel
o 3/4-inch wrench
o 3/8-inch drive ratchet
o 3/8-inch extension
• Prepare your motorcycle. Park your motorcycle on a level surface. Turn off the engine and allow it to cool down. Engage the front brake to keep the motorcycle from rolling.
• Locate the drain plug. The drain plug for the primary chaincase is located on the bottom of the gearbox, on the left side of the motorcycle. It is a 3/4-inch hex-head bolt.
• Place the drain pan under the drain plug. Position the drain pan directly under the drain plug to catch the old oil as it drains out.
• Loosen the drain plug. Use the 3/4-inch wrench to loosen the drain plug. Be careful not to drop the drain plug into the oil pan.
• Allow the old oil to drain. Allow the old oil to drain out completely. This may take a few minutes.
• Replace the drain plug. Once the old oil has drained out, replace the drain plug. Tighten the drain plug until it is snug.
• Locate the oil fill plug. The oil fill plug for the primary chaincase is located on the top of the gearbox, on the right side of the motorcycle. It is a 3/8-inch hex-head bolt.
• Remove the oil fill plug. Use the 3/8-inch drive ratchet and extension to remove the oil fill plug. Be careful not to drop the oil fill plug into the gearbox.
• Fill the gearbox with new oil. Use the funnel to add new oil to the gearbox. Add the recommended amount of oil, as specified in your motorcycle's owner's manual.
• Check the oil level. Use the dipstick to check the oil level in the gearbox. The oil level should be between the "full" and "add" marks on the dipstick.
• Replace the oil fill plug. Once the oil level is correct, replace the oil fill plug. Tighten the oil fill plug until it is snug.
