EchoCs510 chainsaw. 1055 is the shortblock. About 200 online at various places for a shortblock. Crank by itself is 199 list price and is usually about 160..plus you need the bearings and seals... Better to buy a shortblock and transfer the prop driver and carb on and go fly... Also branded as shindawa and i think they also did a few for saws sears under the craftsman name. But it is a echo..