... cooled, 4-stroke,single cylinder, 6.5hp; 2. power from 2.0kw to 6.0kw; 3. hand start ... cooled, 4-stroke,single cylinder, 6.5hp;2. power from 2.0kw to 6.0kw;3. hand start ... or key start & battery ;4. Model : GYF650 650W; GYF950, 800W; GYF1200, 1KW; GYF2500 2 ... .0KW;GYF3600, 2.5KW; GYF3900, 2.8KW; GYF4500, 3.2KW; GYF5500, 4KW; ...