How to Change the Coolant in a 2019 KTM 300XC: A MotoSport.com Guide
Shop parts for a 2019 KTM 300XC Dirt Bike.
Routine coolant changes ensure the 2019 KTM 300XC's robust two-stroke engine operates at peak performance. Regularly replacing coolant protects internal components, prevents overheating, and extends the life of your dirt bike–vital for trail, closed-course, and off-road enthusiasts. This MotoSport-exclusive guide provides step-by-step instructions alongside important 300XC-specific notes.
Tools & Supplies Needed
- Fresh coolant (check KTM–approved formulas for compatibility)
- Distilled water (for proper flush if necessary)
- Funnel
- Container for old coolant
- Socket or wrench for water pump cover bolt (–reference KTM's service manual for diameter); usually 8 or 10 mm
- Clean rag
- Protective gloves
Important Note for 2019 KTM 300XC Owners
KTM updated the water pump and its drain bolt on 2019 models but did not consistently update manual documentation. The correct coolant drain bolt on your 300XC is NOT always the one referenced in older manuals. Double-check which screw sits lowest on the pump cover before removal, as the changes in impeller design for this year altered bolt orientation and drain point (see model-specific notes from experienced owners).
Step-by-Step Coolant Change Process
- Preparation
- Allow the engine to cool completely before beginning.
- Secure the bike upright on a stand for easy access to the radiator and water pump.
- Access and Remove the Radiator Cap
- Remove the seat and shrouds if necessary for easier access.
- Slowly open the radiator cap to relieve pressure.
- Locate and Remove the Water Pump Drain Bolt
- Locate the lowest water pump cover bolt–this is the coolant drain for the 2019 model.
- Position a container underneath the pump, then remove the bolt to drain the coolant completely.
- If you want to flush, reinstall the bolt, fill with distilled water, run the engine briefly, and repeat the drain.
- Optional: Bleed the Cylinder Head
- Loosen the small bleed screw on the cylinder head to ensure a full drain and remove trapped air.
- Once fluid stops leaking, retighten the bleeder screw.
- Refill with Coolant
- With the front wheel elevated (manual recommends roughly 19 inches), slowly pour new coolant into the radiator using a funnel.
- Continue pouring until coolant escapes from the bleed screw without bubbles—indicating no trapped air.
- Reinstall and tighten the bleed screw, then top off the radiator.
- Typical fill is about 1.2 L (1.3 qt.) for KTM 300 models of this era.
- Final Steps: Purge Air & Check Levels
- Reinstall the radiator cap securely.
- Start the engine and let it idle for a few minutes. Rev occasionally to circulate the coolant and dislodge air pockets.
- Stop the engine, allow to cool, reopen the radiator cap, and check the coolant level. Top off if needed.
Extra Tips for Your 2019 KTM 300XC
- Always use high-quality, model-appropriate coolant – avoid mixing different types.
- Inspect hoses, clamps, and the radiator cap for wear; replace if necessary.
- Flush more frequently if riding in muddy, sandy, or extreme cold/hot climates.
- KTM's plastics and aluminum radiators are sensitive to incorrect coolant–stick to recommended brands or formulas.
- Due to KTM's updates in 2019, verify any part or procedure against your model and serial number.
Staying current with coolant maintenance keeps your KTM 300XC running strong on every ride. For replacement coolants, factory hoses, radiator components, and the rest of your maintenance needs, MotoSport has you covered.
Related Shopping Categories
Shop Radiators for a 2019 KTM 300XC Dirt Bike.
Shop Coolant for a 2019 KTM 300XC Dirt Bike.
Shop Temperature Sensors for a 2019 KTM 300XC Dirt Bike.
Shop Tools for a 2019 KTM 300XC Dirt Bike.
Shop Radiator Hoses for a 2019 KTM 300XC 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.