Yeah, it is a 4mix engine. The BR600 BR700 and BR800 are great blowers. I have a BR600 that is 20 years old, used to use it commercially, and is still going strong. Rarely does the cam gear melt.
The carburetor is a Zama if it is OEM, not Stihl. Although Stihl did buy out Zama.
Highly doubtful...