How to change the coolant in a 2020 KTM 300XCW TPI Dirt Bike

How to Change the Coolant in a 2020 KTM 300XCW TPI: Step-by-Step Guide

Shop parts for a 2020 KTM 300XCW TPI Dirt Bike.

The 2020 KTM 300XCW TPI is built for tough enduro and trail riding, and good cooling is critical for peak performance and reliability. Regular coolant maintenance is essential not only for optimal engine temperature management but also to protect vital components from corrosion and overheating. This proprietary MotoSport guide takes you step-by-step through the process, offering tips and model-specific notes to make the job smooth and effective.

What You Will Need

• Fresh coolant (make sure it is motorcycle/engine compatible–avoid using pure water)
• Distilled water (for flushing)
• Drain pan
• Funnel
• Socket wrench set and appropriate sockets
• Flathead screwdriver
• Gloves and eye protection
• Clean rags

Model-Specific Note

The TPI (Transfer Port Injection) 300XCW uses an advanced electronic fuel injection system. It also features a coolant temperature sensor on the cylinder head, which is crucial when bleeding air out of the system after a coolant change. Be careful not to overtighten or damage this sensor during the procedure.

Step 1: Preparation

• Allow the bike to fully cool before starting to prevent burns from hot coolant.
• Prop the bike securely on a stand for easy access to both sides and underneath.
• Remove the radiator shrouds and, if necessary, the fuel tank for better access to the radiators and hoses.

Step 2: Draining Old Coolant

• Locate the coolant drain bolt, typically found at the lowest point of the water pump side (right side of engine).
• Place your drain pan underneath and slowly remove the bolt, allowing all coolant to drain out.
• To speed draining, remove the radiator cap. Be cautious, as a small splash of old coolant may occur.
• Inspect the drained coolant for debris or discoloration, which can indicate engine or cooling system issues.

Step 3: Optional Flushing

• For a thorough job, fill the system with distilled water via the radiator cap opening.
• Replace the drain bolt and run the engine briefly to circulate the water.
• Let the engine cool again, remove the drain bolt, and repeat until only clear water drains out. This removes old coolant and contaminants from the system.

Step 4: Refilling with Coolant

• Reinstall and tighten the drain bolt. Do not overtighten–just snug is sufficient.
• Using a funnel, slowly fill the radiator with fresh coolant. The system holds approximately 1.2 liters, but fill until you see coolant at the top of the radiator fill neck.

Step 5: Bleeding Air from the System

• On TPI models, air can collect in the cylinder head. Loosen the coolant temperature sensor on the cylinder head until coolant begins to seep out, then retighten. This bleeds trapped air and prevents overheating.

Step 6: Finishing Up

• Reinstall the radiator cap securely.
• Start the bike and allow it to run for a few minutes, watching for leaks and monitoring the temperature.
• Turn off the engine and let it cool, then recheck the coolant level–top up if needed.
• Replace the radiator shrouds and fuel tank if removed.

KTM 300XCW TPI Specific Considerations

• The stock coolant T-piece on some 2020 models is made of brittle metal and can be vulnerable to breakage. Many riders upgrade to silicone or aluminum replacements for improved durability and reliability–especially if you ride technical or rocky terrain.
• Always ensure all hose clamps are snug but do not overtighten, as this can damage the hoses or fittings.
• Check for leaks after your first ride by inspecting the hose connections and T-piece.

Pro Tips

• Always use the correct coolant type–some brands are not compatible with aluminum radiators and engine parts.
• Flush and replace coolant every 2 years, or sooner for hard use or harsh climates.
• If unsure about any part of the process, consult your KTM service manual or reach out to MotoSport's customer service team.

Related Shopping Categories

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Shop Temperature Sensors for a 2020 KTM 300XCW TPI Dirt Bike.

Shop Tools for a 2020 KTM 300XCW TPI Dirt Bike.

Shop Radiator Hoses for a 2020 KTM 300XCW TPI 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.