I think it's something to do with U.S. regulations. I believe motorcycle front turn signals here must be amber. You can do that with an amber lens cover or an amber bulb behind a clear lens cover. Yamaha chose to do the amber lens cover and must have used the ugly ones from some other existing model.
I put these on my R3 (get the harness adapters and the relay, too and the whole thing will be Plug-and-Play). They're available in clear and smoked.
https://tstindustries.com/LED-Front-Flushmount-Turn-Signals-Yamaha.html
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