The FS 91 is a 28cc engine and they use a blade on that model.
Here's a link you can use to compare models and engine sizes.
Link.Here's a link for the FS 91.
LinkYeah,....the 27cc motor is about 1/10 hp down from the 28cc motor.
I think the Yard Boss would work as a brush cutting tool. But you'd probably have to let it eat instead of just zinging through a 2 inch limb like a 40cc machine would.
I'm pondering whether I was to spend the money for it. By the time I get it outfitted like I want I'm going to have about $550-$600 in it. I called the local dealer and asked if I could buy it without the tiller head. He said no,.....that's the way they come.
I'd feel better about dropping that much on it if it had a 35-40cc motor instead of the 27.