If your Yamaha DT175 motorcycle is blowing white smoke and losing power when you accelerate, it could indicate a potential issue with the engine's combustion or lubrication system. Here are a few possible causes to consider:
Faulty Piston Rings: Worn or damaged piston rings can allow oil to enter the combustion chamber, resulting in white smoke. This can also cause a loss of power as the oil interferes with proper combustion.
Leaking Cylinder Head Gasket: A damaged or deteriorated cylinder head gasket can allow coolant to enter the combustion chamber, leading to white smoke. This can also cause a loss of power as the coolant affects combustion efficiency.
Faulty Valve Seals: Worn or damaged valve seals can allow oil to enter the combustion chamber, resulting in white smoke. It may cause a temporary loss of power during acceleration until the excess oil is burned off.
Incorrect Fuel-to-Air Mixture: If the fuel-to-air mixture is too rich, it can cause incomplete combustion, leading to white smoke and a power loss. This could be due to a carburetor issue or a problem with the fuel injection system if your motorcycle is equipped with it.
Overfilled Engine Oil: Excess engine oil in the crankcase can be drawn into the combustion chamber, resulting in white smoke. Ensure that the engine oil level is correct and not overfilled.
It's important to have a qualified mechanic inspect your motorcycle to diagnose the exact cause of the issue. They can perform a compression test, inspect the piston rings, check the cylinder head gasket, examine the valve seals, and assess the fuel and ignition systems to determine the root cause of the problem.