I had purchased the 41 engine new from B&B...He refused to repair it, said He couldn't contact the manufacturer, and no new blocks were available... That was last fall!!..
However, B&B did say they would repair it for about $200.00?? I have since purchased a Brillelli 46 with EI.. Smooth and powerful, it hauls the TFGS around with ease.. Unless you find something on Ebay, or at a swap meet, replacement parts are not available for the old 41......
Before I spent too much on the old 41, I would contact Scott at Brillelli Engines .. fine people to deal with, warrant everything they sell, and have a top notch product...