I haven't seen one for a WG-4 anywhere online. Maybe one of the guys here has one they can send you. The AOMCI Western New York chapter has manuals online. Although they don't have Wizard manuals, the WG-4 is based on Mercury's KD-4. Not everything is going to be the same, but they have a K Series parts list (unfortunately, no diagrams) that might help you out if no one else has anything better.