jsw5620 wrote:Do you guys think removing a wire like described in this link would work?
https://answers.yahoo.com/question/inde ... 231AABg7hO
No, that guy is smoking crack. The Razor Dirt Quad uses a hall effect throttle which varies the signal between 0V and 5V. It has three wires going into it, +, -, and the signal wire. Clip any of those and it just does not work at all. It is not a Power Wheels style on/off with a high and low setting.
Stock, the dirt quads are made for torque to get up hills and through grass/dirt. Much faster than a 12V Power Wheels, about the same speed as a 24V overvolted Power Wheels, 8 - 10MPH. Enough to scare your kiddo at first, but I am sure he would grow into it fast.
As Rob mentioned, a physical limiter would be the easiest route and may be worth looking into before changing any of the internals. If you can rig something up that way, it would be easy enough to derestrict when the time comes.