Honda CBR125R Owner's Manual page 167

REPLACEMENT/AIR BLEEDING
Remove the following:
– Lower cowl (page 2-8)
– Radiator cap (page 6-5)
– Single seat (page 2-4)
Remove the drain bolt on the water pump cover and
drain the system coolant.
Reinstall the drain bolt with a new sealing washer.
Install and tighten the drain bolt securely.
Disconnect the siphon hose from the radiator and
release it to the clamps.
Drain the coolant from the reserve tank.
Empty the coolant and rinse the inside of the
reserve tank with water.
Install the siphon hose to the clamps and connect it
to the radiator.
Fill the system with the recommended coolant
When filling the
through the filler opening up to filler neck.
system or reserve
tank with a coolant
Bleed air from the system as follows:
(checking coolant
1. Shift the transmission into neutral.
level), support the
Start the engine and let it idle for 2 – 3 minutes.
motorcycle on a
level surface.
2. Snap the throttle 3 – 4 times to bleed air from the
system.
3. Stop the engine and add the coolant up to the
filler neck.
4. Install the radiator cap (page 6-5).
COOLING SYSTEM
DRAIN BOLT/SEALING WASHER
RESERVE TANK
SIPHON HOSE
CLAMPS
FILLER NECK
6-7