How to Change the Coolant in a 2009 Suzuki RM85L

Shop parts for a 2009 Suzuki RM85L Dirt Bike.

If you want peak performance and reliability from your 2009 Suzuki RM85L, changing the engine coolant is a critical maintenance task. This robust two-stroke features a compact liquid-cooled engine, and keeping its cooling system fresh is essential to avoid overheating, maintain efficient power delivery, and extend the life of internal components. Here's an exclusive guide from MotoSport on how to perform this procedure properly–including special considerations for your RM85L.

Preparation – What You'll Need

  • Gloves and eye protection
  • Suitable drain pan
  • Fresh engine coolant (capacity: 570 ml for the RM85L)
  • Distilled water (if mixing concentrate)
  • Rags for cleanup
  • Replacement sealing washers (if worn)
  • Torque wrench

Step-by-Step Instructions

  • 1. Ensure Engine is Cool: Never remove the radiator cap when the engine is hot—wait for complete cooling to avoid injury from hot fluid or steam .
  • 2. Secure the Bike: Place the motorcycle on a block or sturdy stand to keep it upright and stable .
  • 3. Remove the Radiator Cap: This allows air into the system and makes draining easier .
  • 4. Drain Coolant:
    • Locate and remove the coolant drain plug at the water pump–situated low and typically facing downward on the right engine side .
    • Disconnect the lower radiator hose if needed for complete drainage .
    • Allow all coolant to fully drain into your pan.
  • 5. Refit Drain Plug and Hose: Replace the drain plug (use a fresh sealing washer if necessary) and reconnect the lower radiator hose securely .
  • 6. Refill Coolant:
    • Pour new coolant into the radiator slowly, filling up to the base of the filler neck. Avoid mixing with tap water–always use distilled water if diluting concentrate .
    • The RM85L takes 570 ml (1.2 US qt.) .
  • 7. Burp the System:
    • Start the engine with the radiator cap off and let it idle for several minutes. Gently rock the bike side-to-side or blip the throttle to help release trapped air bubbles (burping) .
    • If the coolant level drops, top it up as needed .
  • 8. Finalize & Inspect:
    • Install the radiator cap securely .
    • Run the engine for a few more minutes for thorough circulation and check the coolant level again when cool–top off if needed .
    • After a full heat cycle, recheck both the level in the radiator and expansion reservoir if equipped .

Key RM85L-Specific Notes

  • Coolant Capacity: 570 ml (1.2 US qt.) makes overfilling or underfilling easy, so measure accurately .
  • Radiator Cap Pressure: Inspect or replace the cap if it can't hold 95–125 kPa (13.5–17.8 psi) .
  • Annual Change Recommended: Suzuki advises flushing and replacing the coolant at least once per year for optimal engine and cooling system health .
  • Only Use Compatible Coolant: Use manufacturer-recommended or high-quality motorcycle coolants to prevent corrosion or deposition in fine radiator fins .

Disposal of Old Coolant

  • Never pour used coolant down the drain or onto the ground–it is toxic. Collect it in a sealed container and dispose of it at a proper auto parts store or recycling center .

Why Change Coolant Regularly?

  • Fresh coolant keeps temperatures stable and prevents your RM85L from overheating during spirited rides or at the track.
  • Proper service avoids costly engine repairs from corrosion, deposits, or overheating.

Changing your coolant is a straightforward task for most DIY owners, but attention to detail ensures your Suzuki RM85L stays cool, runs strong, and delivers reliable fun every season.

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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.