How A Motorcycle Wet Clutch Works Lubricating a clutch with oil seems like an invitation for slippage and inconsistent shifts. Lubricating a clutch with oil seems like an invitation for slippage and inconsistent shifts. However, a properly formulated oil can reduce clutch slippage. Here’s how. Wet clutches are widely used in motorcycles and dirt bikes. The term simply means the clutch is lubricated with oil, as opposed to a dry clutch. A wet clutch typically lasts longer and is more forgiving to operate than a dry clutch. Frictional Performance Vital As shown in the images, the clutch connects the engine and transmission via a series of alternating friction and steel plates. Friction plays a big role in proper clutch operation. To illustrate, imagine sitting aboard a motorcycle or dirt bike with the clutch lever activated, idling at a red light or in a starting gate. The friction and steel plates are separated, allowing the bike to run wit...