The emission of blue smoke is caused by excess oil burning in the combustion chamber. The reasons for this failure are as follows:

1) The oil pan is overfilled with oil. Too much oil will splash against the cylinder wall along with the high-speed crankshaft and into the combustion chamber. The solution is to stop for about 10 minutes, then check the oil dipstick and drain the excess oil.

2) The cylinder liner and piston components are seriously worn and the clearance is too large. If the gap is too large, a large amount of oil will enter the combustion chamber for combustion, and at the same time, the exhaust gas of the engine crankcase will increase. The treatment method is to replace the worn parts in time.

3) The piston ring loses its function. If the elasticity of the piston ring is insufficient, the carbon deposits are stuck in the ring groove, or the ring ports are on the same line, or the oil return hole of the oil ring is blocked, a large amount of oil will enter the combustion chamber and burn, and blue smoke will be emitted. The solution is to remove the piston rings, remove the carbon deposits, redistribute the ring ports (the upper and lower ring ports are recommended to be staggered by 180°), and replace the piston rings if necessary.

4) The clearance between the valve and the duct is too large. Due to wear and tear, the gap between the two is too large. During intake, a large amount of oil in the rocker arm chamber is sucked into the combustion chamber for combustion. The solution is to replace the worn valve and conduit.

5) Other causes of blue smoke. If the oil is too lean, the oil pressure is too high, and the engine is not run in well, it will cause the oil to burn and emit blue smoke.