Bike 11 features a device called a holeshot device. Real motocross riders use this device to help them have better and faster starts. It locks the front shock in a fully compressed state which helps keep the front end low and make the bike accelerate faster. 

The holeshot device will disengage once the front wheel hits a bump or jump. The front fork will then function as normal for the remainder of the race. 

To see a video of it working in real life check out this link: https://youtu.be/ZYws4leQFFQ?t=1m19s