My concern with the S200 would be the stator, which was the subject of a wide product recall in 2007, IIRC. Even with the corrective retrofit, I wonder about the stator's ability to handle a load greater than what the bike's original specs call for. It might help to first change all the indicator bulbs and brake/taillight with LED versions if you are considering an experiment with the higher-wattage bulb. A float charger would probably be a good idea to have handy, just in case.
Disclosure: I put a 60/55W bulb in my 2004 Yamaha Vino many months ago, and have suffered no ill effects, thusfar.
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