What oil do you need for a 140cc pit bike?

For a 140cc pit bike, you typically need a 10W-40 or 20W-50 motor oil, depending on the manufacturer's recommendations and the operating conditions. It's important to use a high-quality, motorcycle-specific oil that contains additives to protect the engine and transmission. Always consult the owner's manual for the exact specifications and oil type recommended by the manufacturer. Regular oil changes will help maintain optimal performance and engine longevity.