How to Change Coolant on a 2015 Suzuki RM85

Shop parts for a 2015 Suzuki RM85 Dirt Bike.

Keeping your 2015 Suzuki RM85’s cooling system maintained is crucial for peak performance – especially if you ride aggressively or in hot climates. Changing the coolant regularly protects your engine and prevents overheating and corrosion. Here’s a step-by-step MotoSport guide tailored to your RM85.

Before You Start

  • Allow the engine to cool completely – opening a hot radiator can cause severe burns and damage.
  • Prepare suitable containers for old coolant and fresh, manufacturer-recommended coolant. Use distilled water if flushing.
  • Wear gloves and goggles for safety.
  • Never use tap water for flushing; it contains minerals that may harm the system.

Step-by-Step Coolant Change Procedure

  1. Locate Radiator Cap – Find and slowly remove the radiator cap (part #1 in the service manual) once the engine is cool

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  2. Drain Coolant – Locate the water pump drain bolt beneath the engine. Place a container under the bolt and remove it carefully.
    The coolant will begin to drain. To speed up draining, you can also gently tilt the bike side to side.
  3. Flush System (Optional) – If switching coolant type or periodically, pour distilled water into the radiator and let it drain out. Repeat until clear.
    Avoid tap water to minimize mineral buildup

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  4. Replace Drain Bolt – Once drained, reinstall the water pump bolt. Tighten to factory torque settings.
  5. Fill with New Coolant – Slowly pour recommended dirt bike coolant into the radiator until it reaches the bottom of the inlet. Allow any air bubbles to escape.
  6. Check for Air Pockets – Some models may have an air bleeder bolt to help with this. The RM85 primarily requires careful filling and engine warming cycles to burp air naturally.
    With cap off, start engine briefly (30–60 seconds) and let idle, then shut down and top-off coolant as necessary.
  7. Secure Radiator Cap – Tighten the cap securely once final level is reached.
  8. Dispose of Old Coolant Responsibly – Take used coolant to a properly equipped recycling facility. Never pour down drains or into soil.

What RM85 Owners Should Know

  • The RM85's cooling system is simple and lightweight, but proper coolant fill level is critical – running low may quickly lead to overheating during high-RPM use.
  • Do not fill above the bottom of the radiator inlet; the system relies on proper headspace for expansion

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  • Always inspect hoses and the radiator cap for cracks or damage before refilling. Replace any worn components for maximum reliability.
  • Factory coolant capacity: Typically approximately 0.9 L (0.95 US qt) for a full system service.
  • Flush interval: Suzuki recommends changing coolant every 2 years or as needed for hard use.

Pro Tips for Longevity

  • Stick to coolants formulated for motorcycle use – automotive coolants may cause corrosion in dirt bike engines.
  • If you crash hard and notice a leaking radiator, fix or replace it before adding new coolant.
  • Ride periodically and monitor the coolant level; add as needed.

Following this guide ensures your 2015 Suzuki RM85 keeps its composure, rides cool, and performs at its best.

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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.