In motorcycles, the Positive Crankcase Ventilation (PCV) valve, or breather valve, is not typically present as it is in cars. Motorcycles usually employ a different system for managing crankcase ventilation.
Motorcycle engines commonly utilize a breather hose or a crankcase vent tube to regulate the pressure and release gases from the crankcase. The breather hose is connected to the engine's crankcase and allows excess gases, oil vapor, and blow-by to escape from the engine. These gases are typically routed back into the air intake system for combustion.
The exact location of the breather hose or vent tube may vary depending on the motorcycle make and model. However, it is usually connected to the engine's crankcase cover or valve cover. You may find it attached to the top of the engine, near the cylinder head or valve train area. It is often connected to the airbox or air filter housing, allowing the gases to be drawn into the intake system.
Please note that there might be variations in the design and setup of motorcycle engines, so it's always a good idea to consult the specific motorcycle's manual or refer to the manufacturer's instructions for accurate information regarding the PCV system.