How to Change the Coolant in a 2021 Suzuki RM85 Dirt Bike

Shop parts for a 2021 Suzuki RM85 Dirt Bike.

Routine coolant changes ensure the 2021 Suzuki RM85 stays cool through every moto, vital for performance and engine longevity given the RM85's hard-revving nature and two-stroke design. Here's a MotoSport-exclusive guide to flushing and refilling coolant on this specific model.

Preparation

  • Let the bike cool off fully–hot coolant can cause serious burns.
  • Lift the bike securely using a stand.
  • Gather a drain pan, funnel, fresh coolant (Suzuki's OEM coolant recommended), soft cloths, and a socket set (8mm for water pump bolt).

Draining Old Coolant

  • Remove the radiator cap; this lets air in and encourages complete drainage.
  • Locate the water pump–on the right crankcase, toward the lower side. Remove the 8mm drain bolt at the bottom of the water pump and let coolant flow into your drain pan.
  • Dispose of old coolant according to local hazardous waste guidelines.
  • For a thorough flush, pour distilled water into the radiator after the main coolant has drained. Let this rinse through repeating the drain process until outflow is clear. Avoid tap water–minerals can build up and damage the cooling system.

Bleeding & Refilling

  • Reinstall the water pump drain bolt securely by hand, then snug with appropriate torque to avoid cross-threading.
  • Pour fresh coolant into the radiator slowly; air may escape from the system as you fill. Fill until just beneath the filler neck.
  • On models with a bleed screw on the radiator, open briefly as you fill to ensure trapped air escapes. Once fluid runs from the bleeder, close it.
  • Inspect the radiator cap for damage, then reinstall it tightly. Wipe up any spills with a clean rag.

Post-Procedure Checks

  • Start the bike and let it idle for a few minutes. Shut off, let cool, and recheck coolant level–top off if necessary.
  • Inspect all fittings for leaks, especially the water pump and hose joints.

Model-Specific Notes

  • The RM85 has a compact cooling system–avoid overfilling which can lead to gasket leaks or improper pressure.
  • Suzuki recommends their own OEM coolant 99000-99032-11X for best performance and corrosion protection.
  • This model's smaller radiators mean even small cooling losses could lead to overheating; check your hoses for age cracks and inspect the radiator cap for tightness every service.
  • Never mix coolant types–if switching formulas, flush thoroughly with compressed air or repeated distilled water fills.

With these steps, your 2021 RM85 will maintain optimal engine temps, allowing you to ride worry-free whether on the track or trail. Stay up-to-date with all essential OEM parts and upgrades above – MotoSport is here to keep your ride running strong.

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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.