How do you change gear oil on Chinese 125cc ATV?

To change the gear oil on a Chinese 125cc ATV, first locate the gear oil drain plug, usually at the bottom of the transmission case. Remove the drain plug and allow the old oil to completely drain out. Once drained, replace the drain plug and refill the gear oil through the fill plug, using the recommended type and amount of oil specified in the owner’s manual. Finally, check for leaks and ensure the oil level is correct before taking the ATV for a test ride.