What weight gear oil do you use in a 1985 kawasaki 440 jet ski?

For a 1985 Kawasaki 440 Jet Ski, you should use a 30-weight oil for the engine and a gear oil with a weight of 80W-90 for the transmission. Always refer to the owner's manual for specific recommendations and ensure that the oil meets the appropriate API classifications. Using the correct oil is crucial for optimal performance and longevity of the engine and components.