I am just curious. Who still rebuilds them. Where are you located at and what is the average shop labor rate in your area. Also when you rebuild what parts do you replace? I know there are some out there that just stick new rings in and call it a day...Not really a rebuild/overhaul... My dad used to overhaul a few K181's a month back when Kohler generators were the norm. When he did this he would bore the cylinder, put in new piston, rings, rod...I assume he would probably do a valve job at the same time. But anymore with the cost of parts and labor its just not cost effective to do it at least in this neck of the woods. Our shop rate is 60/hr and thats probably average or below average around here. Usually a complete engine is the way to go...only way with Kawasaki or Honda. Sure you could overhaul some of the larger ones for less than a new one but you get a 2 year warranty with the new one.