This is printed on the back of my S1000
It's the standard PC/Computer style connector. Took the picture though cuz you'll def want to make sure the power specs match your country power, or risk blowing the transformer. You can certainly do upgrade/replacements on the transformer to convert it to whatever you want, but either be sure you know what you are doing or pay somebody to do it.
The transformer upgrade is worth doing if it hasn't been done anyways, because with the old caps, it'd be sad to fry an S1000 without having done such a simple upgrade.