Yeah, that is the case with a lot of equipment. Have a 3 wheeled mower(trimmer?) that has a cast iron deck, heavier than crap, but you can't tell it is 80 years old(3rd or 4th engine on it) Also have a rototiller that is about the same age that can till rocks, but, beats the crap out of the operator. That's on the second engine after the original one failed(Onan engine). Both were my grandfather's and he got them in his small engine shop(swapped for other work).