AX- 1 Honda 250 motorcycle engine rings and emits blue smoke.

It seems that the valve is not tight and the air inlet is damaged. I suggest you buy an AX- 1 machine as a maintenance part. It is best to replace the whole cylinder head, or grind the valve and do a water permeability test until the sealing is restored. Then carefully adjust the valve clearance. AX- 1 is a classic car, so it is not difficult to find its valve clearance adjustment parameters. After the valve problem is solved, see if the oil is still emitting blue smoke. If it is still serious, check the tightness of the cylinder block, cylinder gasket, cylinder wall and piston ring.