I have a Stihl BG 86 hand held and a Stihl BR 600 back pack blower, the difference in air flow has caused me to retire the BG 86!! I was just at my local Stihl/Scag dealer and I see that Stihl has come out with several new back pack models and improved the BR 600. Pricey but much more effective, so check out the Stihl back packs some of which have 4 stroke engines but still mix fuel/oil. I'm not anti Husqvarna, my chain saws are all Husqvarnas, I like they way they handle compared to Stihl saws and much easier to work on.
Mad Mackie in CT