Harry-in the morning I'll see if I can get some good closer shots of the chunk that's missing in the cylinder skirt,from what my engine guru says this engine should be totally rebuildable after all but I'm think for the sake of forward progress on Iron Patriot I'm going to explore the duel hydros motor.when I picked up these tractors last week I pulled the sticks on both motors...one had no oil..the broken one and duel hydro has plenty of good "clean/cleaner oil" so my hopes are high for that engine.ill post an update tomorrow when I look at it more in depth