Yes, I finally had a chance to closely look at the engine. Here's what I found, In the engine instructions it shows several diagrams of the carb. One with the throttle down with a slight opening in carb, the other with the throttle down and trim down with the carb completely closed. So I 'assume' that the carb should close. But when I setup the servo linkage to move freely, I can't even get the carb to close completely. So I also tried adjusting the throttle lever and still no sucess. Am I missing something or is this correct?