How to Change the Coolant in a 2019 KTM 150XCW
Shop parts for a 2019 KTM 150XCW Dirt Bike.
Changing the coolant on your 2019 KTM 150XCW is a vital maintenance task to keep your two-stroke engine running clean and cool through every ride. Follow these specific steps and take note of details particular to this lightweight and highly-tuned machine for the best results.
What You Need
- Quality engine coolant compatible with aluminum radiators and magnesium parts (avoid automotive antifreeze with silicates)
- Socket or wrench for drain bolt
- Funnel
- Clean catch pan
- New washer for the drain bolt (recommended)
- Rags or paper towels
- Protective gloves
Step-by-Step Coolant Change for KTM 150XCW
- Ensure the bike is cold. Never open the radiator cap or drain coolant from a hot engine. Place your bike on a level stand for stability.
- Remove the radiator cap. Locate the cap on the left radiator. Twist it counterclockwise and set aside. Loosening the cap breaks the seal and helps coolant drain quickly (if you remove the drain bolt first, little will come out until you open the cap).
- Drain the coolant. Locate the coolant drain bolt on the water pump cover (typically a 6mm bolt at the bottom right side of the engine case). Position the catch pan under the bolt. Remove the bolt and washer, allowing coolant to drain completely from both radiators. To ensure full drainage across both sides, let the radiators empty out until the flow stops.
- Replace the washer and reinstall the drain bolt. It's highly recommended to use a new crush washer for a leak-free seal. Reinstall the bolt and tighten securely (consult your owner's manual for torque specifications).
- Flush (Optional but suggested): If the old coolant appeared dirty or contaminated, pour in a small amount of distilled water, reattach the bolt, shake the bike gently, then drain again. Repeat if needed.
- Fill with new coolant. With a funnel, slowly pour the recommended coolant into the radiator until it reaches the base of the fill neck. The KTM 150XCW uses a small capacityavoid overfilling. Pour gradually to minimize air bubbles.
- Bleed air from the system. On the KTM 150XCW, persistent air bubbles can affect performance. While filling, you can gently tilt the bike side to side and squeeze radiator hoses to help bubbles escape. For even better results, some owners remove the temperature sensor or thermostat briefly from the cylinder head while topping off to allow trapped air to escape. Tighten it down after filling. Top off coolant as needed.
- Reinstall the radiator cap. Make sure it seats securelydo not overtighten.
- Warm up and recheck. Start the engine and let it idle until warm. Shut off and let it cool. Recheck coolant level and top off if needed. Inspect for leaks at the drain bolt and hoses.
2019 KTM 150XCW Owner Notes
- The 150XCW is known for its high-revving engine and tight tolerances. Always use a coolant suitable for magnesium and aluminum, as the wrong type can corrode internal passages.
- Do not mix coolant types. Drain thoroughly if switching brands or formulas.
- Check regularly for leaks near the water pump seal and hose junctions. The lightweight radiator design offers excellent cooling, but hoses and seals can age quickly on hard-ridden bikes.
- If you frequently ride in very cold or hot climates, check your coolant mix ratio based on the temperature range listed on the coolant bottle.
Staying on top of your KTM 150XCW's coolant health keeps your engine performing at its peak, round after round. This simple maintenance pays off every ride.
Related Shopping Categories
Shop Radiators for a 2019 KTM 150XCW Dirt Bike.
Shop Coolant for a 2019 KTM 150XCW Dirt Bike.
Shop Temperature Sensors for a 2019 KTM 150XCW Dirt Bike.
Shop Tools for a 2019 KTM 150XCW Dirt Bike.
Shop Radiator Hoses for a 2019 KTM 150XCW 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.