An ATV driver? You mean an ATV racer.
Light being on means overdrive is inactive
overdrive off
extra heart.
cubic centimeter
All Terrain Vehicle
race
What do you mean
Gross weight
If the overdrive's off light is on that means it's off. If it is off then the overdrive is on.
OD means Overdrive. The light is on because you have disengaged the Overdrive. The button is on the shift lever on the side. Push that button to engage the overdrive.
When the overdrive light blinks that means a malfunction has been detected - get it checked out