[ex-sco77morgan]

To change the timing insert take the screw in the center of the end bell out and the cover comes off. Then the rectangle plastic piece which fits around the socket where your sensor lead goes will have some dots moulded into the surface. Easy way to know is look in the bag inside your motor box if you have one with 2 dots and 3 dots then the 4 dot one is already in there. Older motors came with 2 dot as standard. Newer motors come with 4 dot standard