I would stick with the 1.7 watt bulbs. I am sure the enclosure would stand the heat but the brilliance of the 5 w might be a real distraction if you were to ride after dark. Now to find bulbs other than Kymco might be a challenge! Pull one or all and 1. make sure they are all the same and 2. try and find an auto parts replacement. You can find the type on the internet where pictures are available. Most catalogs like Mouser Electronics have dimensions.
Karl
