Manufactured according to YAMAHA standard. It adopts anti-shock balance mechanism of YAMAHA, which obsorbs inertial force of back and forth movement of crank connecting rod effectively; Connecting rod copper-plating technology from YAMAHA largely improves the strength and service life; The gear grinding technology from YAMAHA promotes the accuracy of high-speed gear of balance axle 1~2 classes, and reduces noise; The whole cylinder head is good at thermal diffusivity, low in noise without oil leakage.