My boy is 9. I bought him a KLX 110 a couple Christmases ago. He is still really timid on that thing and I'm trying to get him over his fear of bikes. I think his fear is why he seems kind of disinterested in riding his bike. He never really asks to ride; I always have to suggest it.
I started by having my dad pick him up in the sidecar.
Pic:
https://goo.gl/photos/Zav539TqMVK5F21w9
Then I took him around the neighborhood on the 14.
After he relaxed a bit, we rode to football practice.
Pic:
https://goo.gl/photos/6VWrHWmPpNKgiAas6
Now I can't get him off the thing!
Here's hoping that turns into more KLX time for him!