Order code: GRWTP004. UM: DSR Adventure 125 UM125-ADV, DSR Adventure TT UM125-ADT, DSR EX UM125-DEX, DSR SM UM125-DSM, Scrambler Classic 125 UM125-SC, Scrambler S 125 UM125-SS. The water pump drive gear in a motorcycle transmits rotational motion from the engine to the water pump, ensuring effective circulation of coolant throughout the engine to regulate temperature and prevent overheating.