How to Change the Coolant in a 2011 Suzuki RM85: Step-by-Step Guide

Shop parts for a 2011 Suzuki RM85 Dirt Bike.

Regular coolant changes are essential for the health and performance of your 2011 Suzuki RM85. This guide from MotoSport.com walks you through each step, with special notes for the unique features of this high-revving two-stroke dirt bike.

Important Notes Before You Start

  • Always allow the engine to cool completely before servicing the cooling system to prevent burns from hot coolant or steam—the cooling system in the RM85 operates under pressure when hot.
  • Never use tap water for flushing–use distilled or deionized water to prevent mineral buildup.
  • 2011 RM85 coolant capacity is approximately 950 ml.

Supplies You Will Need

  • Fresh engine coolant formulated for aluminum engines (avoid pre-2000s green coolant not rated for motorcycles)
  • Distilled water (if flushing)
  • Socket or wrench set (8mm for drain bolt)
  • Drain pan
  • New drain bolt gasket (recommended)
  • Rags or shop towels
  • Safety gloves and eyewear

Step 1: Preparing the Bike

  • Ensure the bike is parked upright on a level surface.
  • Remove the seat and side panels as needed to access the radiator cap and coolant hoses.
  • Double-check the engine is cool before proceeding.

Step 2: Draining the Old Coolant

  • Place a drain pan underneath the water pump–the drain bolt is typically located at the lowest point of the pump cover on the right side of the engine.
  • Remove the radiator cap to allow air in and improve draining.
  • Loosen (or fully remove) the coolant drain bolt and let the old coolant flow out completely. Move the bike gently side to side to help drain any trapped coolant.
  • If doing a flush, pour distilled water into the radiator and briefly reinstall the drain bolt. Start the engine and let it idle for a minute, then repeat the drain process. Continue until only clear water drains out.
  • Replace the drain bolt, ideally with a new gasket, and tighten to manufacturer spec (typically 8.0 lbf-ft or 11 N·m for Suzuki dirt bikes).

Step 3: Filling with New Coolant

  • Slowly pour coolant into the radiator filler neck until it reaches the bottom of the neck. Allow air bubbles to escape as you fill.
  • If your RM85 has an air bleeder bolt, loosen it while filling to ensure no air remains trapped in the system. Tighten the bleeder after coolant flows steadily from it.
  • Install the radiator cap securely.

Step 4: Bleeding Air and Checking Levels

  • Start the engine and idle for a few minutes, gently revving a few times to circulate the coolant and help release air bubbles.
  • Shut the engine off and allow it to cool. Re-check coolant level and top off if necessary.
  • Final coolant level should be at the base of the filler neck with the radiator cap removed and the bike cool.

Step 5: Clean Up & Disposal

  • Dispose of used coolant properly–never pour it down drains or on the ground as it is toxic to wildlife.
  • Wipe up any spills and reinstall any panels or parts removed.
  • Inspect hoses and radiator for leaks or cracks–replace parts as needed.

Special RM85 Considerations

  • The 2011 RM85 is known for having a high-revving engine that produces significant heat during aggressive riding. Monitor coolant level regularly, especially between motos or rides.
  • Inspect the radiator for any fin damage or bends, as this model relies heavily on efficient airflow and cooling for best performance.
  • If the bike has sat unused, always check the condition of the radiator cap and hoses—these rubber parts can become brittle on older two-strokes.

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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.