I bought an 06 450 recently and tore her down to check the engine before I took her out in the forest. I was shocked to find something has been bouncing around in the engine and punched a hole in the case forward of the crankshaft into the oil tank. Some genius J.B. Welded a patch over it. A co-worker of mine is extremely good at Tig welding and said he could fix it. Has anyone had any experience with repairing engine cases with success? Any comment would be greatly appreciated.