I have just become the stepfather of two boys, ages 9 and 13. They have never ridden a motorcycle but are very interested. I would like to introduce them to our wonderful sport this year. I think the best way to start them will definitely be on a four stroke. I am looking for any input on the brands and models that would be appropriate. They rode my buddy's sons KX65 last year and were more than a little intimidated by the power of the bike and the need to constantly shift. I am thinking about an XR80 or 100 for the 9 year old and an xr 200 for the 13 year old. Also have looked at the Yamaha TTR. Any thoughts would be greatly appreciated.