doyam chainsaw.5.2/7.1kW/hp, power to weight ratio of 1.4kg/kW, displacement of 91.6cc, maximum speed of 13500rpm, idle speed of 2500rpm, mass of 7.3kg. These parameters indicate that the doyam660 g660 660av gasoline saw has high efficiency and performance, making it suitable for various logging and landscaping operations. In addition, the design of the doyam660 gasoline saw takes into account extreme load conditions and adopts a proven configuration, making it a very powerful and efficient chainsaw, particularly suitable for harvesting hardwood. This chainsaw also features anti rebound design, with tightly arranged tooth pitch, a saw chain pitch of 3-8mm, a transmission chain thickness of 0.056mm, an external dimension of 660 660av mm, and a weight of 4.6kg. These characteristics make the doyam660.660av gasoline saw widely used in the field of professional logging