With filter change, the '04 and '05 take 0.87 quarts. After '05 takes 0.73 quarts. The engine oil is separate from the transmission oil on the 450R and that's why it takes such a small amount. For the transmission oil, the '04 and '05 takes 0.58 quarts and after '05 takes 0.72 quarts.
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.