hello

Welcome, Mauricio you should google Stretch Cruisers or Limo Bicycles you will see many American online stores selling these types of bicycles, just make sure they ship to Columbia.S.A.

Google Searches related to Stretch beach cruiser

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They're are two types of 4-stroke engines some are the type that look like power washer, and some lately have been using Chinese Cloned Honda Trail 70 mini bike engines.

You can try one of the forum sponsor advertisers like BikeBerry.com listed above.

Hope this helps!

Peace Crazy Horse.

P.S. Here's a Link of advertisers from google just click on the Link here:
Stretch beach cruiser - Google Search