I have Husqvarna (435/41cc- originally 16", now 18" and 455 Ranch/55cc) and Stihl (two 066s, two 044s, 038, MS660 and MS440).
I'm in the process of rebuilding the older Stihl 066s and 044s -- new seals on crankshaft (both sides), carb rebuilds, new shock mounts and the only downside is special...