Custom Pullback Luxury car

I made my own motor since no Lego pullbacks comfortably fit my chassis style. Check the video to see it run.

 

The green bar holds two tiny gears, which engage with the larger gear when the axle moves backwards. (The large gear winds up the elastic). When pressure stops being applied, so the engine has run out of juice, the bar lifts a little and the car freewheels.

Done