Zhengdong Yamaha's 125 scooter just ran 17000 km, and it was very boring. I had to step on the gas (2/3) before I left. The fastest runner that day was 80, the most. ...

Without the brand of "Zhengdong Yamaha", the scooter lacks power, which is mostly related to the blockage of the air filter. First check and clean the air filter. If it is too dirty, replace the qualified genuine filter element in time, and the inferior filter element will hurt the car. In addition, the power is affected by the excessive wear and slip of the belt or pulley, and the wear of the valve rocker arm and camshaft.