How to Change the Coolant in a 2022 KTM 150XC-W TPI

Shop parts for a 2022 KTM 150XC-W TPI Dirt Bike.

Routine coolant changes are essential to keep your 2022 KTM 150XC-W TPI running at its best, especially given its advanced 2-stroke TPI (Transfer Port Injection) system, which relies on optimal engine temps for performance and reliability. KTM engineered this model with high ground clearance, nimble handling, and a light frame, but overheating and old coolant can bring even this race-bred dirt bike to a halt. Here's a step-by-step guide specific to your KTM 150XC-W TPI, including critical notes about its design and what to watch for.

Tools & Supplies Needed

  • OEM-recommended coolant (ensure it's compatible with aluminum radiators and engine parts)
  • 8mm and 13mm sockets/wrenches
  • Flathead screwdriver
  • Drain pan
  • Funnel
  • Pliers (if hose clamps are used)
  • Shop towels/rags
  • Gloves and eye protection

Before You Begin

  • Let the engine cool completely to prevent burns from hot coolant.
  • Work in a well-ventilated area since some coolant can be toxic.
  • Use only non-silicate, phosphate-free coolant to protect KTM's magnesium and aluminum components.

Step 1: Access the Cooling System

  • Remove the seat to access the radiator cap. On the 150XC-W TPI, the radiator cap sits at the top of the right radiator.
  • Use a flathead screwdriver to release any plastic shroud fasteners, if needed.

Step 2: Drain the Old Coolant

  • Place a drain pan beneath the bike.
  • Remove the radiator cap to allow air in–this speeds up drainage.
  • Locate the cylinder drain bolt on the water pump cover (usually 8mm) on the right side of the engine, below the radiator hose.
  • Carefully loosen and remove the bolt. Allow all coolant to drain into the pan.
  • If equipped, gently squeeze the lower radiator hose to help evacuate any remaining coolant.

Step 3: Optional–Flush the System

  • If your coolant shows contamination or discoloration, reconnect the drain bolt and refill with distilled water.
  • Run the engine briefly (no more than 1-2 minutes), then drain again. Repeat until water runs clear.
  • Be sure to fully drain all water before filling with new coolant.

Step 4: Refit the Drain Bolt

  • Reinstall the coolant drain bolt. Tighten securely (but do not over-torque–snug is sufficient).
  • Replace any sealing washers if they appear damaged or deformed.

Step 5: Refill with Coolant

  • Using a funnel, slowly add fresh coolant through the radiator neck.
  • To prevent air pockets, fill gradually and gently squeeze the hoses as you pour.
  • The 150XC-W TPI's cooling system capacity is approximately 0.75L (check owner manual for precise volume).

Step 6: Bleed Air from the System

  • This KTM has parallel radiators, so air trapped in one side can affect cooling. After filling, let the bike sit for several minutes; gently rock it side to side to encourage any bubbles to rise.
  • For an ultra-thorough bleed, remove the temperature sensor (thermostat) on the cylinder head as recommended by KTM to allow trapped air to escape, then reinstall securely before topping off the coolant.

Step 7: Top Off & Reassemble

  • Continue adding coolant until the level reaches the bottom of the radiator neck.
  • Reinstall the radiator cap.
  • Reattach all shrouds and the seat.

Step 8: Start & Check

  • Start the engine and idle for 2-3 minutes. Check for leaks at all hose connections and the drain bolt.
  • Let the bike cool, then recheck and top up coolant if needed. A small drop in level after first heat cycle is normal as air escapes from the system.

Important Model-Specific Notes

  • The 2022 KTM 150XC-W TPI's TPI system is sensitive to overheating; regular coolant maintenance is critical for engine longevity and TPI function.
  • Avoid mixing coolant colors or types–always use fresh, compatible coolant per the owner's manual.
  • Inspect hoses for cracks or leaks during service, as flexible lines are prone to abrasion from debris common in off-road riding.
  • Keep an eye on the water pump and temperature sensor gaskets in older or hard-ridden bikes, as these can weep coolant if worn.

Staying on top of coolant changes prevents serious engine overheating and helps you get the most out of your KTM every ride. For all your 150XC-W TPI maintenance parts and upgrades, MotoSport has you covered.

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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.