The presence of white smoke, oil coming out of the exhaust, and a loss of power on your two-stroke motorcycle, such as the Aprilia RS 125 2010, can indicate a few potential issues:
Oil Injection System: Two-stroke engines require a mixture of fuel and oil for lubrication. If the oil injection system is malfunctioning or not properly adjusted, it can lead to an excessive amount of oil entering the combustion chamber. This can cause white smoke and oil to be expelled through the exhaust. Additionally, an improper oil-to-fuel ratio can result in poor combustion, leading to a loss of power.
Piston Rings or Cylinder: The piston rings in a two-stroke engine help seal the combustion chamber and prevent the fuel mixture from entering the crankcase. If the piston rings are worn or damaged, they may allow oil to pass into the combustion chamber, causing excessive smoke and oil in the exhaust. This can also lead to a loss of compression, resulting in reduced engine power.
Cylinder Head Gasket: A faulty cylinder head gasket can cause oil to leak into the combustion chamber, resulting in oil being burned and expelled through the exhaust. This can produce white smoke and contribute to power loss.
Air/Fuel Mixture: An incorrect air/fuel mixture can impact the combustion process in a two-stroke engine. If the mixture is too rich (excessive fuel), it can lead to incomplete combustion, the production of oil-rich exhaust, and a subsequent loss of power.
It is recommended to have a qualified motorcycle mechanic inspect your Aprilia RS 125 to diagnose the exact cause of the issue. They can perform tests and examine the relevant components to determine whether it's related to the oil injection system, piston rings, cylinder, gasket, or other factors. Timely and accurate diagnosis will help identify the specific problem and enable the appropriate repairs to restore your motorcycle's performance.