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1 - Water inlet pipe 2 - Water outlet pipe of main water tank 3 - Water inlet pipe of main water tank 4 - Connecting pipe of
auxiliary water tank 5 - Water inlet pipe of cylinder 6 - Water inlet pipe of water pump cover
Cooling system:
Small loop (indicated by the blue arrow):
Water pump → cylinder inlet pipe → cylinder → thermostat → small circulation outlet pipe → water pump cover inlet pipe
Big loop (indicated by the green arrow):
Water pump →Water pump cover outlet pipe→ Cylinder →Thermostat →Water pump cover inlet pipe
D125
1- Secondary water tank 2-Secondary water tank link pipe 3-Engine inlet pipe 4- Thermostat outlet pipe 5- Thermostat 6- Water
tank inlet pipe 7- Water and oil shared sensor 8- Water tank outlet pipe 9- Water tank filling port 10- Radiator assembly 11-
Water pump cover assembly
M125 cooling system:
Small loop (indicated by the blue arrow):
Cylinder → thermostat → Water tank inlet → water tank → Water tank outlet pipe → Engine inlet pipe → water pump cover
Big loop (indicated by the green arrow):
Cylinder → thermostat → Thermostat outlet pipe → Engine inlet pipe → water pump cover
Cooling system disassembly
Caution:
●Before disassembling, please refer to the steps of
discharging the cooling liquid in the cooling system section of
the "Maintenance" chapter to drain all the cooling liquid
first.
●Wear protective measures such as waterproof gloves and
protective glasses during disassembly, and prevent the
coolant from contacting the skin.
●The disassembly operation must be performed after the
engine, radiator, and muffler are completely cooled.
D125 Remove the radiator assembly
a. Refer to the steps of "removing spark plugs", remove
the right pedal in the same way, remove the fixing bolts of
the right pedal, and turn over to the back. Remove 2 M6 with
8 # socket × 22. Remove the right pedal and the surrounding
component after the bolt ⑴. Place an oil pan under it and
clamp it with hoop pliers φ 10.5 Remove the hoop (2)
about 40mm (1.6 in) in the direction of the arrow, wear
waterproof gloves with both hands, pull out the connecting
water pipe (3) of the auxiliary water tank, and use an oil pan
to catch the coolant that may remain in the water pipe and
the auxiliary water tank.
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