Cooling system
Checking the radiator
In this manual: Cooling system
~1min read
1. Check:
Radiator fins obstruction
clean.
Apply compressed air to the rear of the radiator.
Damage
repair or replace.
NOTE:
Straighten any flattened fins with a thin, flat-head screwdriver.

2. Check:
- Radiator hoses Cracks/damage
Replace.
3. Measure:
- Radiator cap opening pressure Below the specified pressure
Replace the radiator cap.
a. Install the radiator cap tester "1" and radiator cap tester adapter "2" to the radiator cap "3". 

b. Apply the specified pressure for ten seconds and make sure there is no drop in pressure.
4. Check:
- Radiator fan Damage
Replace.
Malfunction
Check and repair.
Refer to "COOLING SYSTEM" on page 8-25.
Test yourself
A quick Yamaha YZF-R125 quiz: every answer comes with an explanation and a link to the manual page.
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