Hi- bought a tinny with a 5hp Mariner o/board & it started beautifully but when I got it home & took it out on the lake it starts but won't go into forward or reverse gear. The lever seems just totally jammed. Any suggestions guys?
Check the gearlube. Check the linkages for free movement. Some motors won't allow shifting if the throttle is too high, check for maladjustment of that as well.