Thanks for reminding me and bringing this post to my attention again. I thought I had done a update on it but that was on the other site.
I did this border crossing from Mexico to Guatemala again this past March 2009 and also enjoyed the new pavement- so much that after spending the night in El Naranjo I went back to the El Ceibo border and then continued back into Guatemala and on to Panama and return.
There is only a partial customs service on the Guate side , as you discovered. There is only a Migracion for Guatemala agent, but no SAT office to do the temp import for the bike or car. This can create problems for the traveller who wants to go farther in CA to Honduras , as I discovered.
If you are going to visist ONLY Guatemala it is not such a big issue as you will be heading back out to Mexico or Belize and can arrange the temp import at one of the inland SAT offices or at the border just before leaving, if they are raising a stink that you should have it. Or leave GT by the same EL Ceibo crossing.
I found out at the Aguacaliente crossing to Honduras that the woman in charge of the SAT office was stuborn and adamant in not allowing my bike out of GT without me going back to the Mexican frontier to get that paperwork done.
To get around this problem I suggest that other travellers with the same dilemma do as I did: go to the Florido Copan crossing into Honduras. The officials there are much more understanding and flexible as they deal with a regular stream of tourists. They WILL let you exit Guatemala if you explain clearly why you could not obtain a temp import permit at El Ceibo.They will even issue you that document if you want, but save your money and do it on the return leg of the trip if that is your route plan.
As the road from El Ceibo is still brand new it is to be hoped that Guatemala will soon install a full service border processing office there . Hours of service are currently only from 9 to 5 but as more commercial traffic builds and the route becomes popular that may be expanded.
We could all drop an e-mail to the Guatamala tourist department suggesting that they upgrade their tourist border crossinbg service at El Ceibo.

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http://advrider.com/index.php?thread....207964/page-5 then scroll down to post #93