There's a big difference between 9 and 14. I've already read the riot act tonight, in full hearing of Kyle. And he's taken out the 4 wheeler, barefoot and with no helmet, and managed to get it stuck. How was he able to start it? Didn't I have the key put away somewhere safe (i.e. inaccessible to 9 year olds)?
Regardless, the scenario says he KNOWS he's not allowed to ride without permission and supervision, and he's just heard me tell off his brother for doing the same thing, albeit safely.
He's toast. At 9, he's going over my knee for a light thin very stingy paddle. He'll be spanked privately, though at his age, I'm pretty sure everyone will know what happened, because it will be audible.