The diameter of the left crank of the crankshaft is strengthened to enhance the strength of the crank and ensure the service life of the crankshaft；
Silent chain is adopted for the chain, making the engine quieter；
The tension structure adopts spring automatic tension mechanism, which can automatically adjust the tension according to the chain tension, reduce the chain transmission noise and increase the chain service life；
Performance optimization After the optimization of engine transmission ratio and exhaust system, the engine performance at low and medium speeds has been significantly improved；
Economy The engine has low fuel consumption and good emissions per hundred kilometers, which is suitable for the needs of modern life；
Practical electric/foot start modes to meet the needs of different people。
