I put my BME 44 in hard. Broke off some rear cooling fins and bent the crank. Sent it to Keith at BME. It took awhile, but he replaced the crank, cleaned it up, and sent it back. Something like $200 to fix it. He did not fix the cooling fins, so I assume they are not critical. I'll be hopefully flying it again this summer. I'd send the engine back to BME.
Sam