Yamaha YZF-R125 Owners Manual: Coolant

The coolant level should be checked before each ride. In addition, the coolant must be changed at the intervals specified in the periodic maintenance and lubrication chart.

To check the coolant level

  1. Place the vehicle on a level surface and hold it in an upright position.

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  • The coolant level must be checked on a cold engine since the level varies with engine temperature.

  • Make sure that the vehicle is positioned straight up when checking the coolant level. A slight tilt to the side can result in a false reading.

  1. Check the coolant level in the coolant reservoir.

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The coolant should be between the minimum and maximum level marks.


  1. Coolant reservoir

  2. Maximum level mark

  3. Minimum level mark

  1. If the coolant is at or below the minimum level mark, remove the reservoir cap.


  1. Coolant reservoir cap

  1. Add coolant to the maximum level mark, and then install the reservoir cap. WARNING! Remove only the coolant reservoir cap. Never attempt to remove the radiator cap when the engine is hot.

    NOTICE: If coolant is not available, use distilled water or soft tap water instead. Do not use hard water or salt water since it is harmful to the engine. If water has been used instead of coolant, replace it with coolant as soon as possible, otherwise the cooling system will not be protected against frost and corrosion. If water has been added to the coolant, have a Yamaha dealer check the antifreeze content of the coolant as soon as possible, otherwise the effectiveness of the coolant will be reduced.

Coolant reservoir capacity (up to the maximum level mark):

0.25 L (0.26 US qt, 0.22 Imp.qt)

Changing the coolant

The coolant must be changed at the intervals specified in the periodic maintenance and lubrication chart. Have a Yamaha dealer change the coolant.

WARNING! Never attempt to remove
the radiator cap when the engine is hot.

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