I have a friend who works in an AKT store in Bogota, if you didn't mind riding a half chinese / half colombian motorcycle around Colombia then I could message her on Facebook, she added me after selling us our bikes last year.
They come with a 12,000km guarantee (more than enough for Colombia), free services every 2000kms and they have stores all over the country. The paperwork takes 5 days to process and then you're on your way.
Also you could easily resell the bike upon returning to Bogota, we sold ours in Cartegena within 2 days and there was only 3 compra-ventas for motorcycles there, in Bogota they have like 100.
Keep in mind that in most of Colombia the roads are top notch but they move slowly with all the corners and trucks etc so you don't need a big bike there, we had two 125s and never really needed anything more. A 200cc would be more than fine if you're going 2-up.
Anyways message me if you want me to contact her and also this is their website if you want to see what they have: http://www.akt.com.co
AKT were really good to us and I highly recommend them to anyone, especially those who are on a budget.