There is another option...

-I entered from Panama by boat, and received 90 days.
-Before 90 days I went to the Bogota DIAN office, (near the airport)
-Have time on your passport, I got a year long student visa (paid around 350$ for 2 months at Universidad Nacional De Colombia, then about 90$ for the visa) before going.
-Because if you have time on your Visa, you can get another 90 days.
-Once you have this EXTENSION PAPERWORK (EP) you are in the clear!
-This EP is all about 3 pages and is VERY easy to make change to the dates and you can keep using for months to come.

>You do not need this EP or any bike paperwork to exit at Ipiales/Tulcan.
>Police are the only ones that look at your paperwork. I always handed them my copy of my original entry paperwork (which was expired) and rarely do they look it over thoroughly. If they did I would so sorry and this is the correct one, the EP. This one is VERY hard to find the dates on because of how they have it written up.
>I spent over 16 months in Colombia without any problems.

Side note: This all started after I tried to get a second EP legally, but it had expired. I "made a friend" there the first time through because we had the similar bike and he remembered me. He was saying because it was expired, my ONLY options was to leave the county and or make a fake copy. He also said if you don't get in an accident you will never be caught.

I cannot recommend this because it is illegal, police so rarely see gringo bikes, they rarely see this paperwork and never the EP... but it works
Good luck
EW