Dolmar 420/421/4300 Makita
I have a 420. Awesome little saw, and not so heavy as people are inclined to believe relative to their competition (is there any competition) and the easiest starting piece of equipment I have ever owned.
right now, sadly, mine has a fuel delivery issue. No big deal, I'll get to it...
I also need a new spur clutch drum as mine is worn.
meanwhile I'll run my Jonny 2152 in it's place. : ) , or one of my Jonny 590's which are still the best 50cc saws I've ever run. I just like how they handle and their really nice style of power. Or maybe my 5105, which will fairly easily out-buck them all but doesn't handle as nicely for limbing.
the 420 will do anything the 50's will do. With the lopro chain it will nearly but not quite run equal to them. It's all in the tune of the chain anyway...