Have done the cases on both of my bikes. Aircraft Remover from the auto paint section in walmart and harley texture black from the dealer work really well. The aircraft remover is in a spray can, so mask the timing chest, cylinders, trans, and oil pan really well. Use a wire brush about tooth brush size and water hose to get the old paint off. Let it dry over night and re-mask if needed before paint. Also cover all body panels with old towels or sheets as the paint spray can travel with the breeze.