My sad story of how I came to once again tearing about my engine was described here, http://www.ducatimonster.org/smf/index.php?topic=58350.msg716422#msg716422
This past weekend I was at last able to take apart the engine and found the source of the problem. On the vertical cylinder, the hole which receives the piston pin on one side of the piston had enlarged, allowing the piston additional play on one side. As a result of this play, the piston had rubbed against the cylinder wall. The cylinder bore had two small spots where I could feel some aluminum had been deposited by the piston. I should mention the engine had a BCM 795 big bore kit. I honed the cylinder and can no longer feel any scratches in the bore although some discoloration remains. So my questions are. Has anyone had similar piston/pin failures? What could cause such a failure and how can I prevent it in the future? How can I determine if the cylinder is reusable?
This past weekend I was at last able to take apart the engine and found the source of the problem. On the vertical cylinder, the hole which receives the piston pin on one side of the piston had enlarged, allowing the piston additional play on one side. As a result of this play, the piston had rubbed against the cylinder wall. The cylinder bore had two small spots where I could feel some aluminum had been deposited by the piston. I should mention the engine had a BCM 795 big bore kit. I honed the cylinder and can no longer feel any scratches in the bore although some discoloration remains. So my questions are. Has anyone had similar piston/pin failures? What could cause such a failure and how can I prevent it in the future? How can I determine if the cylinder is reusable?