How to Change the Coolant in a 2019 Suzuki RM85

Shop parts for a 2019 Suzuki RM85 Dirt Bike.

Maintaining proper coolant levels is crucial for keeping your 2019 Suzuki RM85 running reliably and preventing engine overheating. Changing the coolant is a straightforward but essential maintenance task. Here is a step-by-step guide specifically for this MMY dirt bike model, along with key details unique to the RM85 platform.

What Makes the RM85 Unique?

The 2019 RM85 is designed with a lightweight chassis and high-revving two-stroke engine, making cooling efficiency particularly important. Due to the small displacement and typical hard riding conditions, always use the correct coolant type recommended by Suzuki and ensure the radiator system is clean and leak-free. The radiator cap and hoses should be inspected for wear during coolant swaps, as this model is sensitive to improper sealing or blockages.

Step-by-Step Coolant Change Guide

  • Wait for the engine to completely cool down before starting. Draining hot coolant can cause serious burns and increasing system pressure can result in hazardous fluid spray. Never attempt with the engine hot.
  • Place a drain pan under the lower side of the radiator.
  • Remove the radiator cap slowly to release any residual pressure. The cap is usually on the top of the left radiator; twist it counterclockwise while pressing down gently to the first stop, then fully remove it once the hissing stops.
    Note: RM85 radiators are compact, so be cautious to avoid spilling coolant onto electrical connectors.
  • Locate and remove the coolant drain bolt, typically found at the base of the water pump cover on the right side of the engine. Some models may have a dedicated drain plug; if so, consult your owner's manual for the exact location.
    Allow all the coolant to drain fully. Tilting the bike to the left (carefully) can help ensure complete drainage.
  • If you're switching coolant types (for example, from a water-based to a propylene glycol-based coolant), flush the system with distilled water to minimize compatibility issues. Pour distilled water into the radiator and repeat the drain process one or two times, rotating the kickstarter gently to circulate water, but without starting the engine. Let all flush water drain out completely.
    Pro-Tip: Do not use tap water, as minerals can cause corrosion inside your cooling system.
  • Reinstall and tighten the drain bolt. Always start threading it by hand to avoid cross-threading. Torque the bolt as specified in the Suzuki RM85 service manual.
  • Fill the radiator slowly with the recommended coolant up to the bottom of the neck. Squeeze the radiator hoses gently to help remove trapped air.
  • Bleed the system: Start the engine and let it idle for a few minutes with the radiator cap off. Watch for air bubbles as trapped air purges from the system. Top off the coolant as necessary.
  • Replace the radiator cap, ensuring it sits tight to maintain system pressure.
  • Inspect for leaks around the drain bolt, hose clamps, and cap. Wipe off any spilled coolant and rinse affected areas to prevent paint or metal corrosion.

Additional Notes for RM85 Owners

  • This bike's high-revving nature makes proper cooling especially vital; never ignore low coolant warnings or leaks.
  • Inspect radiator and water pump gaskets for leaks—these are common failure points in aggressive riding environments.
  • For extended engine life, change coolant at least every 12 months or after significant mud/dust rides, as debris may degrade cooling performance.

Routine coolant changes keep your 2019 Suzuki RM85 running cooler, lasting longer, and performing at its best every ride.

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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.