I've got an 86 250cc utility that I want to change the rear end oil on. What kind of fluid/oil do I need to use and how full do I fill it? Thanks.

 

Use the Honda 90 weight gear oil. There should be a fitting on top of the differential to fill it up and a screw on the side that you remove to know when you have filled it the correct amount(oil will start to come out the screw hole).