If your motorcycle is blowing white or gray smoke at the redline but not at low speeds, and you suspect that gasoline is mixing with the oil, there may be an issue with the fuel injector or another related component. Here are a few potential problems to consider:
Fuel Injector Malfunction: A malfunctioning fuel injector can cause an improper fuel spray pattern, leading to incomplete combustion and fuel leakage into the oil system. This can result in white or gray smoke at high engine speeds. A clogged or stuck injector may also contribute to this issue.
Fuel Pressure Regulator: The fuel pressure regulator is responsible for maintaining the correct fuel pressure in the fuel system. If it malfunctions, it can cause excessive fuel pressure, resulting in fuel entering the oil system and causing smoke at high RPMs.
Air/Fuel Mixture Imbalance: An imbalance in the air/fuel mixture, such as a rich mixture, can cause unburned fuel to enter the oil system. This can happen due to a faulty sensor, such as the oxygen sensor, or a problem with the electronic fuel injection (EFI) system.
Cylinder or Piston Ring Issues: If the motorcycle's cylinders or piston rings are worn or damaged, it can lead to poor combustion and fuel leakage into the oil system. This can result in smoke at high RPMs.
Crankcase Ventilation System: The crankcase ventilation system is responsible for removing gases from the engine's crankcase. If the system is clogged or malfunctioning, it can cause pressure buildup inside the engine, leading to oil and fuel mixing and smoke.
To pinpoint the exact problem, it is recommended to take your motorcycle to a qualified mechanic or a dealership with expertise in your motorcycle's make and model. They can perform a thorough inspection, conduct diagnostic tests, and address the issue accordingly. Proper diagnosis is essential for an accurate repair and to prevent further damage to the engine.