check out RAM mounts, they have been making mounts for years. Not sure if they have a dedicated "motorcycle" mount for the iphone, but i know they do make motorcycle mounts for other units.
I personally use my Garmin 705, which is a bicycle GPS enabled computer. Came with the entire US maps, fits in pocket easily, and two zip ties and it mounted no problem.
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 Wood
LRRS #853
94 888 LTD (red)
996RS (blue)
01 748R (yellow)
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