If you look at the serial number of the unit it will tell you the production date. the first two numbers are the year, next two are the month. Our units are like cars, it maybe built in September but it would be a 2013 model.
That Honda engine is sweet. Smooth and quite like most Honda's. When it comes to HP Honda does things different. They rate their horsepower by net not gross. It's a different rating that shows more of a true HP where it's needed. I would compare that engine with any other 27hp marketed out there.
I invite others that have used that engine to chime in.