When a motorcycle is blowing blue smoke, it typically indicates that there is an issue with the combustion process or lubrication system. Here are a few common reasons for blue smoke:
Oil Consumption: Blue smoke can occur when oil is being burned within the combustion chamber. This can happen due to worn piston rings, valve stem seals, or cylinder walls, allowing oil to leak into the combustion chamber. As a result, the oil burns along with the fuel, producing blue smoke from the exhaust.
Engine Overfill: If the motorcycle's engine has been overfilled with oil, it can cause excessive oil consumption and lead to blue smoke. This can happen when too much oil is added during an oil change or due to a malfunctioning oil level sensor.
Faulty PCV Valve: The Positive Crankcase Ventilation (PCV) valve helps regulate the flow of gases within the engine. If the PCV valve becomes clogged or fails, it can cause excessive oil consumption and lead to blue smoke.
Worn Valve Guides: Valve guides are responsible for guiding the movement of the valves in the cylinder head. When these guides become worn, they can allow oil to seep into the combustion chamber, resulting in blue smoke.
Faulty Turbocharger or Supercharger: If your motorcycle is equipped with a forced induction system such as a turbocharger or supercharger, blue smoke can indicate issues with these components. Faulty seals or worn bearings can cause oil to enter the combustion chamber, leading to blue smoke.
If your motorcycle is blowing blue smoke, it is recommended to have it inspected by a qualified mechanic. They will be able to diagnose the specific cause of the issue and recommend the necessary repairs to address the problem effectively.