After giving it much thought I have determined that I am one of those old industrial diesel engines. A 2 cyclinder, naturally aspirated model found in industrial equipment. I don't generate much power, operate at low rpm, make an awful lot of noise for little result, and balk at the slightest increase in workload. That being said I do eventually get me and my bike where I need to go and back home again. So while I may be slow I do get the job done.
What kind of engine are you?