Piece of light cardboard bent and taped over the top as a sunscreen? If that works get some thin styrene sheet (any good hobby shop), bend it to fit with a heat gun, and paint it black. Add a couple of pieces of Velcro for a more permanent fix.
Scott Craig - Nashville, TN
Red '06 Suzuki DL650 - Red '07 Honda VFR800 - My Bike Page