I had a AGM30 that they left one of the piston pin retainers out at the factory. The piston pin scored the cylinder and it lost compression. They did not have the parts to fix it so I asked for my money back. They told me by email to send it to their USA warehouse in San Jose, CA and they would refund my money. I sent it priority mail with tracking. When the PO tried to deliver it the place was closed and out of business. My engine is now at the San Jose post office for two weeks waiting for them to pick it up. They did not. Now not answering my emails. Now I don't have the engine and I don't think I will ever see a refund. The version 2 cylinders were machined wrong and never did run right. I think that may have put them out of business. BEWARE of AGM