COOLANT REPLACEMENT. Honda CBR125R

COOLING SYSTEM

RADIATOR CAP/SYSTEM PRESSURE

INSPECTION

Remove the radiator cap (page 6-5).

Wet the sealing surfaces of the cap, then install the cap onto the tester.

Pressurize the radiator cap using the tester. Replace the radiator cap if it does not hold pressure, or if relief pressure is too high or too low. It must hold the specified pressure for at least 6 seconds.

RADIATOR CAP RELIEF PRESSURE:

93.2 – 122.6 kPa (0.95 – 1.25 kgf/cm 2 , 13.5 – 17.8 psi)

RADIATOR CAP

Pressurize the radiator, engine and hoses using the tester, and check for leaks.

RADIATOR CAP TESTER

RADIATOR CAP TESTER

Excessive pressure can damage the cooling system components. Do not exceed 122.6 kPa (1.25 kgf/cm 2 ,

17.8 psi).

Repair or replace components if the system will not hold the specified pressure for at least 6 seconds.

Remove the tester.

Install the radiator cap (page 6-5).

COOLANT REPLACEMENT

PREPARATION

• The effectiveness of coolant decreases with the accumulation of rust or if there is a change in the mixing proportion during usage. Therefore, for best performance change the coolant regularly as specified in the maintenance schedule.

• Mix only distilled, low mineral water with the recommended antifreeze.

RECOMMENDED ANTIFREEZE (Except CM type):

High quality ethylene glycol antifreeze containing silicate-free corrosion inhibitors

RECOMMENDED ANTIFREEZE (CM type only):

Pro Honda HP coolant or equivalent high quality ethylene glycol antifreeze containing silicate-free corrosion inhibitors

STANDARD COOLANT CONCENTRATION:

1:1 (mixture with distilled water)

ANTIFREEZE

SOLUTION

(ETHYLENE

GLYCOL BASE

SOLUTION)

LOW MINERAL

OR DISTILLED

WATER

COOLANT

6-6

COOLING SYSTEM

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.

DRAIN BOLT/SEALING WASHER

RESERVE TANK

CLAMPS

When filling the system or reserve tank with a coolant

(checking coolant level), support the motorcycle on a level surface.

Fill the system with the recommended coolant through the filler opening up to filler neck.

Bleed air from the system as follows:

1. Shift the transmission into neutral.

Start the engine and let it idle for 2 – 3 minutes.

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).

SIPHON HOSE

FILLER NECK

6-7