I would disagree with getting a 5 port as your first engine. The 3 port sport will break in easier and run just as long. It will not have the power of the 5 port but if you are new you will probably drive better with less power. Also people starting out sometime have trouble getting dirt in an engine or not getting it tuned right and can ruin an engine. Atleast you aren't out as much if you bought the sport. With a little modding the sport is a very good engine, I have one I modded that runs right with a 5 port.

Rex