Been very happy with my G-85D with the 8hp diesel over the years.
One thing I did learn the hard way....check the oil EVERY time. I always put fresh in mine for the fall storage, and one spring I got it out and fired it up w/o checking.....about 5 minutes later, I had a "runaway" diesel on my hands....an engine that was screaming at some unbelievable RPM for a diesel, and no way to shut it off ( I later learned I should have jerked the air cleaner off and stuffed my shirt in it to choke off the air supply).
Seems over the winter, diesel fuel leaked past the pump seal, located low on that engine, and ran into the crankcase.....which IF I had checked the oil level, I would have seen...and when it heated a little, that extra volume was slipping past the piston rings and burning away ! You haven't truly lived until you hear a diesel go to chainsaw revs ! ahahahaaaaaa....
Anyway, after a few minutes, it finally quit, with me hiding behind the shed expecting it to blow in a million pieces at any time. I changed oil, fired it back up, running at a nice steady low rpm, and had no issues with it since.