What Causes a Motorcycle to Emit Blue Smoke?

[LaKinsley]

If a motorcycle's exhaust pipe emits blue smoke, it may be due to excessive engine oil level, low cylinder compression ratio, or increased clearance between the piston and cylinder. The specific inspection steps are as follows: 1. Excessive oil level: First, check whether the engine oil level is too high. Since the engine temperature is relatively high during operation, it can cause the oil to rise. It is necessary to check whether the oil level is normal. Note that the oil level should not be checked while the engine is running or immediately after stopping, as the high temperature can cause the oil to rise, potentially harming the skin. If there is too much oil, you can use a syringe to extract the excess or drain it. 2. Piston and cylinder wear: If the oil level is normal, check the cylinder compression pressure and the wear of the piston, piston rings, and cylinder. The issue may be caused by increased clearance between the piston and cylinder. If this fault occurs, the piston should be cleaned or replaced promptly. 3. Installation error: For engines that have just been repaired, incorrect installation of the piston ring's inner or outer cut can cause oil to rise. In such cases, the piston rings should be reinstalled correctly.