I just bought a reconditioned Weedeater leaf blower that I'm going to covert. When I started taking it apart I noticed that the pull cord turned it in the wrong direction. I've already put a prop on it and started it, so I know it will run opposite to the direction intended. My question is, how will the timing be affected? Wouldn't it normally fire slightly before TDC. If it runs backward, won't it be firing after TDC? If so, won't it lose performance?