How to Change the Coolant in a 2014 KTM 125SX: The MotoSport Guide
Shop parts for a 2014 KTM 125SX Dirt Bike.
Changing the coolant in your 2014 KTM 125SX is an essential part of maintaining peak performance and reliability on the track or trail. The 125SX uses a liquid-cooling system that helps keep the engine's temperature under control even in demanding conditions. Regular coolant flushes not only prevent overheating, but also guard against internal corrosion and premature wear.
Tools & Supplies Needed
- 8mm socket or wrench
- Screwdriver (for removing radiator shrouds if necessary)
- Drain pan or container
- Funnel
- Fresh coolant (mixed and ready to use, 1.2 L or 1.3 qt.)
- Clean rag or paper towels
- Protective gloves and eyewear
Steps to Change the Coolant
- Let the bike cool. Never open the radiator cap or work on the cooling system when the engine is hot—the system will be under pressure, and hot coolant can cause severe burns.
- Place the bike upright on a stand or flat surface.
- Remove the radiator cap by turning it counterclockwise. If the cap is stuck or difficult to remove, remember there's a safety mechanism so apply firm, steady pressure.
- Locate the coolant drain plug. On the 2014 KTM 125SX, the drain bolt is typically found on the water pump cover, secured with an 8mm bolt. Place a drain pan under the area before proceeding.
- Remove the drain bolt carefully to let the old coolant drain into your pan. Allow it to fully drain. Inspect the sealing washer (replace if worn or damaged).
- Reinstall the drain bolt once draining is complete. Tighten to the proper torque if specified (commonly around 15Nm).
- Fill the radiator slowly with your pre-mixed coolant using a funnel. For the 125SX, the capacity is about 1.2 liters (1.3 quarts)*. Fill until the radiator is completely full.
- Reinstall the radiator cap securely.
- Start the engine and let it idle until it gets warm. Shut it off, let it cool, then remove the cap and check the coolant level again. Top up if necessary.
- Dispose of old coolant safely, following local hazardous waste regulations.
*Check your owner’s manual or radiator markings for exact capacity and always use recommended coolant types for KTM motorcycles.
Special Notes for the 2014 KTM 125SX Owner
- The 125SX radiator cap is specified at 1.8 bar (26 psi); check and replace the cap if it cannot hold proper pressure as this is crucial for cooling system function.
- For bikes used regularly in sand or wet conditions, clean and align radiator fins and check the air filter covers–KTM provides specific dust and rain covers for optimal protection.
- Inspect all hoses and clamps for leakage or wear during coolant service; coolant leaks often begin as small seeps.
- Always use gloves and avoid coolant skin or eye contact. If coolant is swallowed, seek medical assistance immediately.
Routine coolant changes are a critical part of keeping your KTM 125SX running strong. A little time spent in the garage will help your bike deliver reliable power, run cooler, and last longer–whether you’re racing or trail riding.
Related Shopping Categories
Shop Radiators for a 2014 KTM 125SX Dirt Bike.
Shop Coolant for a 2014 KTM 125SX Dirt Bike.
Shop Temperature Sensors for a 2014 KTM 125SX Dirt Bike.
Shop Tools for a 2014 KTM 125SX Dirt Bike.
Shop Radiator Hoses for a 2014 KTM 125SX Dirt Bike.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.