What year and model is Identifiacation Honda eng tbo5e-6121605?

Hi there, your Honda ATC200X is a 1984 model. With a engine serial number of ATC200X 1984 (E) Very few changes for 84 model ATC200X, swingarm changes from tubular steel to box section Engine Number TB05E-6100001~ See web site link http://www.atcheaven.com/Model_ids_p3.htm