Why does the motorcycle emit blue smoke after changing the engine oil?

[Eileen]

Motorcycle emits blue smoke after changing the engine oil for the following reasons: Oil level too high: First, check whether the oil level is too high, as excessive oil level can easily cause oil to rise. When checking the oil level, do not do so immediately after the engine stops. Wait for 10 minutes after shutdown before checking. If the oil level is too high, the excess oil should be drained promptly. Increased piston clearance: If the oil level is normal, for engines that have been in use for a long time, check the cylinder compression pressure and the possibility of increased clearance due to wear of the piston, piston rings, and cylinder, which can cause oil to rise. If the cylinder pressure is found to be below the specified value, further check whether the piston has carbon deposits causing it to stick, excessive wear, or loss of elasticity. If any of these conditions are present, the piston rings should be cleaned or replaced. If the cylinder liner is severely worn and the clearance between the piston and cylinder exceeds the specified value, the cylinder should be rebored, and the piston should be replaced.