Yamaha Tian Jian valve problem

Have you tried turning Wan Ciwang repeatedly? When testing the valve clearance, the situation you mentioned may be caused by the valve being too tight when you are adjusting it. When adjusting the valve of chain machine, the magneto must be rotated repeatedly, so that the valve clearance is the same every time the magneto rotates. Of course, this will also happen if the valve clearance is too large. If you don't trust the oil, you can put some oil out of the mineral water bottle to see if there are any impurities or moisture. Sometimes there are problems because your car is in 2009. You can check the oil quality, I hope it can help you.