How to Change the Coolant in a 2010 Suzuki RM85L

Shop parts for a 2010 Suzuki RM85L Dirt Bike.

Keeping your 2010 Suzuki RM85L performing at its best starts with routine maintenance, and coolant replacement is key to protecting your engine and ensuring efficient operation. This proprietary MotoSport guide will walk you through a hassle-free coolant change, covering unique details every RM85L owner should know.

Tools & Supplies Needed

  • Socket wrench with metric sockets
  • Drain pan
  • Phillips screwdriver
  • Fresh coolant (motorcycle-specific, pre-mixed or recommended dilution)
  • Funnel (small tip for radiator neck)
  • Gloves & shop towels

Step 1: Prepare Your RM85L

  • Let the bike cool completely–never open the radiator cap on a hot engine to avoid burns from steam or hot coolant.
  • Place the RM85L upright on a stand or stable block for easy access and maximum drainage.

Step 2: Drain Old Coolant

  • Remove the radiator cap slowly to release any pressure.
  • Position a drain pan beneath the water pump or bottom radiator hose.
  • Locate and remove the coolant drain bolt (typically found on the lower side of the water pump housing) and disconnect the lowest radiator hose if additional drainage is needed.
    Engine coolant capacity: 570 ml (about 1.2 US pints)
  • Allow all old coolant to drain fully. Dispose of coolant responsibly.

Step 3: Reinstall Components

  • Reinstall and tighten the drain bolt securely.
  • Reconnect any hoses that were disconnected.

Step 4: Refill With New Coolant

  • Using a funnel, pour fresh, high-quality coolant into the radiator until it reaches the base of the filler neck.
  • Gently rock the bike side-to-side to release trapped air bubbles.
  • Top off if the level drops as air escapes.

Step 5: Bleed the Cooling System

  • Reinstall the radiator cap firmly.
  • Start the engine and let it idle for several minutes, then gently rev up to operating temperature (no thermostat on this two-stroke, so watch for normal heat at the radiator).
  • Turn off the engine and allow it to cool fully.
  • Check the coolant level again and top off if needed–air pockets can settle after the first heat cycle.

Step 6: Final Checks

  • Inspect the system for leaks around the drain bolt, hoses, cap, and radiator.
  • Verify the radiator cap and pressure relief are sealing properly–damaged caps should be replaced to avoid overheating issues.

Model-Specific Tips for the 2010 Suzuki RM85L

  • The RM85L's compact two-stroke engine has a relatively small fluid volume; check coolant levels before every ride, especially after heavy track use.
  • This model uses a radiator cap with a 95 – 125 kPa pressure range; a weak cap can lead to low boiling point & overheating.
  • Always use a motorcycle-specific coolant to prevent magnesium and aluminum corrosion in the RM85L's sensitive cooling system.
  • Replace coolant hoses if they show soft spots, cracks, or bulging–this is common as these bikes age and helps prevent mid-ride failures.

Staying on top of coolant maintenance on your 2010 Suzuki RM85L helps avoid costly repairs and keeps your bike ready for any moto adventure. Regular flushing also prevents scale build-up and maintains optimal operating temps, so your RM85L can run cool lap after lap.

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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.