You're going to have to pull the top off and see what is stamped onto the jets. If I recall correctly, the eBay guy tries to jet and tune your carb based on the info you provide when ordered.
Its close...but fine tuning makes it better. You have to do this with any carb you buy, as there are just to many variables to factor in. Once you determine what is in the carb buy a couple sizes of jets higher and lower then swap them out till you feel its at its best.
Tuning a carb is becoming a lost skill, and it usually takes a couple of tries to get it right, but its worth it.