If they're in the carb body and they are just flat across the top and don't have a place for a wrench or screwdriver, they're not supposed to come out.
Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!
You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.