Just finished up putting together one saw made from two. Customer bought 2 MS440s from an auction. One blown up and the other in good shape, but taken apart. Request was to make one good saw out of it. So I took the one that had a good piston and bearings and used the spare cylinder that came with the saw. Fresh head gasket and cranks seals, carb kit, fuel line, filter, and spark plug, and a Super good cleaning and she came right to life at the 2nd pull. Saw has a little air leak I need to fix, and I made a few test cuts and it does darn good.