- Shindaiwa's new 446s small pro saw features a 2.9-hp output and 44.6cc displacement. The 8.8-lb. unit offers one-piece ignition and choke-throttle interlock for fast starting, Walbro boot-mounted carbretor, winter and summer settings on the carburetor air box to eliminate icing, anti-vibration system and a wide-mouth gas cap. The 446s can mount saw bars from 14 to 18 in. in length.