I was riding with a few other guys from Brazil who attempted this crossing about 1-2 weeks ago and were unsuccessful. According to them, the path to the border is more like an animal trail and is very difficult on a motorbike. They got a couple kilometers down it before having to turn around due to very deep water crossings and waist deep mud.
Here's the photo he posted on facebook of him 'illegally' leaving Chile in Villa O'higgens  They had to drag the bike under the barb-wire fence.
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