I bought an OS FX 61 engine from a guy in Peurto Rico. He had lots of good guy reviews so I took a chance. I just sent him a money order. The engine was barely used as described but the needle valve was missing. I emailed him and he said that it probably got misplaced when he packed the engine for shipping. He ordered another one and sent it to me as soon as the order came in. Some times you get lucky!