@RTW Yes that's right, and applies to everyone, not just foreigners. It's possible to apply for an extension, but normally the bike has to be back in Chile after six months at most. Obviously if you "lose" the bike somewhere else and just fly home then there won't be any repercussions unless you plan to settle in Chile in the future.
I'm actually quite amazed that you got into so much trouble because of the ID-Tax-registration card ( calling it a "carnet" will just confuse people ), arriving late. I think it's just a "jobsworth" situation. I don't physically possess an ID card, although I have the RUT number in my head as well as in my Chilean passport, it's never been an issue anywhere.


@Jozhuag, here's another link to get you started: Guide to Buying a new motorcycle (or a car) in Chile for foreigners | Ondrej Jurik . There's plenty more to read on the HUBB on this subject.
You can also resell the bike quite easily, in Chile. If you happen to buy new then it's fairly easy to come up with a buy back agreement with a dealer, and for a small fee they will probably be willing to take care of the paperwork themselves ( apart from the Tax registration/ID card)

Antonio,

Yes I think that was the case as two separate lawyers both said that all one needs is the number. In the end the RUT tax registration card arrived and the registry civil allowed me to proceed with the padron. So in general, is it safe to advise others that in theory, all they need is the piece of paper with the RUT and nada mas?

Klrs
 

Never seen 2010 KLRs in Chile at those prices, more like double that.

PS

Do you know what sort of fines/repercussions you'll be subject to if you cross the boarder late?