I have one of the Scags (Turf Tiger 61") with 1,700 hours and are just developing a head gasket leak, going to remove the heads and give the a slight cut on the milling machine and go back together, still don't smoke and its a B&S engine, I have two Cubs with 500 hours and are still doing great and one with Turf Tiger that has the 72" deck with 400 hours that has been terrible abused my the previous owner but getting it in shape, must have got in a wreck to have twisted a 72" deck, ????? then I have one I call the Black Cat (Turf Tiger 61" cut) with the Liquid water cooled Kawasaki, that is a piece of junk, got it from a fellow with only 200 hours, it had been in a shop several times changing the head gaskets (water getting in the cylinders) I shaved the head with a 5 thousands cut and found a casting problem on the inside of where the gasket would be, next cut the same depth found a hole on the other side of where the gasket would be, so makes sense when the engine heated up the holes would allow water to communicate into the cylinder, then took a 3 thousand cut and they were both gone, changed the water pump, it ran fine for a few cutting the started having a real bad miss, changed the plugs, finally contacted Kawasaki and the young tech told me it was the coils, really showed good fire for me but went a head and changed them, same results, called him back he said it was the electric fuel pump, wrong again, hear some street talk that they had several bad fuel pumps and still selling them, it does have the fuel injection, for now put it aside with other repairs going on, I think I am going to trash that motor later and put a Diesel three cylinder off a kaboto from a G1900, with a cutting torch, welder, Lathe , Milling Machine everything is possible.