How to Change the Coolant in a 2016 Suzuki RM-Z250

Shop parts for a 2016 Suzuki RM-Z250 Dirt Bike.

Keeping your 2016 Suzuki RM-Z250 running at its best requires routine maintenance, including regular coolant changes. The RM-Z250's aluminum radiator and complex cooling passages demand high-quality, compatible antifreeze to prevent corrosion and provide superior protection. Below is a MotoSport-exclusive, step-by-step guide tailored to your specific model to ensure your coolant swap is safe, clean, and thorough.

What You Need

  • Engine coolant suitable for aluminum radiators, pre-mixed 50:50 with distilled water
  • Socket wrench set
  • New drain bolt gasket washer (mandatory for proper sealing)
  • Clean funnel
  • Protective gloves and eyewear
  • Drain pan
  • Rags for cleanup

Model-Specific Safety Alert

  • Never open the radiator cap when the engine is hot. Scalding liquid or steam can cause serious injury.
  • This model does not use a coolant overflow tank–expect the coolant level to fluctuate and check it before every ride.
  • Coolant is toxic to people and animals. Immediately flush any spills off your skin, and induce vomiting and see a doctor if swallowed.

Step 1: Prepare the Bike

  • Allow the bike to cool completely before any work begins.
  • Stand the RM-Z250 upright on a solid, level surface using a bike stand.

Step 2: Remove the Radiator Cap

  • Slowly unscrew the radiator cap to allow any residual pressure to escape.

Step 3: Drain the Old Coolant

  • Place a drain pan beneath the water pump area of the engine.
  • Locate the engine coolant drain bolt (bottom of the right engine cover) and remove it along with the gasket washer.
  • Let the old coolant completely drain. Inspect the old coolant for debris or oil contamination—both could indicate engine issues.

Step 4: Replace the Drain Bolt Gasket

  • Always install a fresh gasket washer on the drain bolt to avoid leaks and maintain system pressure integrity.
  • Reinstall the drain bolt. Torque it to 11 Nm (1.1 kgf-m, 8.0 lbf-ft).

Step 5: Fill with New Coolant

  • Use a high-quality, aluminum-compatible coolant mixed 50:50 with distilled water. If you ride in extreme cold, increase the antifreeze ratio up to 60 percent for enhanced freeze protection.
  • Loosen the air bleeder bolt as needed to allow any trapped air to escape during filling.
  • Pour coolant slowly into the radiator until the level reaches the bottom of the filler neck. The total capacity is approximately 950 ml.
  • Tighten the air bleeder bolt once only coolant (no air bubbles) is flowing steadily out, if applicable.

Step 6: Final Checks

  • Secure the radiator cap, ensuring it locks firmly in place.
  • Start the engine and let it idle for a few minutes. Watch the coolant level as trapped air escapes—top off as needed.
  • Inspect all fittings and hoses for leaks. Wipe up any spilled coolant immediately.

Recommended Practices for the 2016 RM-Z250

  • Inspect your coolant level before each ride, as this bike lacks an overflow tank and can lose coolant through the breather hose.
  • Never use plain water without antifreeze. This weakens cooling performance and exposes the aluminum alloy to corrosion.
  • Periodically check radiator fins, hoses, and mounts for cracks, damage, or leaks.

With proper coolant changes and diligent inspections, your 2016 Suzuki RM-Z250 will be ready to handle the hardest rides with factory-spec cooling performance—only from MotoSport.

Related Shopping Categories

Shop Radiators for a 2016 Suzuki RM-Z250 Dirt Bike.

Shop Coolant for a 2016 Suzuki RM-Z250 Dirt Bike.

Shop Temperature Sensors for a 2016 Suzuki RM-Z250 Dirt Bike.

Shop Tools for a 2016 Suzuki RM-Z250 Dirt Bike.

Shop Radiator Hoses for a 2016 Suzuki RM-Z250 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.