If the saw is to be used for occasional tree trimming around the yard and electricity is available, I would suggest getting a corded 110 volt electric chainsaw. I bought an 8 amp 14" Remington electric chainsaw 24 years ago for about $35. and it still performs very well. There are many brands to choose from, ranging from 8 to 15 amp, with 14" to 18" bars, priced at $50. - $150. High performance, light weight, fewer parts, and you don't have to worry about the carburetor getting gummed up while it's not in use. Oh yeah, no friggin pull rope either.

It would be awesome if battery technology were improved, so as to allow for a viable cordless electric chainsaw. Not to mention, all other gas powered devices and vehicles, as well.