How to Change the Coolant in a 1989 Suzuki RM80: Step-by-Step MotoSport Guide

Shop parts for a 1989 Suzuki RM80 Dirt Bike.

Changing the coolant on your 1989 Suzuki RM80 is essential for keeping its two-stroke engine running cool and protected, especially since this classic model is popular for its punchy mid-range power and lightweight handling. Here–s how you get it done, with exclusive tips for RM80 owners.

What Makes the RM80 Unique

  • This model uses a compact liquid-cooled engine with a single radiator—be sure to inspect for any leaks or damage when servicing coolant.
  • The cooling system is simple, but prone to collecting debris in the radiator fins if you ride off-road frequently. Clean the fins using compressed air or a gentle brush.
  • Always use a motorcycle-specific coolant suitable for aluminum parts to avoid corrosion and overheating.

Before You Begin

  • Gather a catch pan, fresh coolant (pre-mixed or mix 50/50 with distilled water if using concentrate), an 8mm socket, and protective gloves.
  • Work on a cool engine to prevent burns.
  • Set your bike on a sturdy block for stability.

Step-by-Step Instructions

  1. Remove the Radiator Cap: Locate and unscrew the radiator cap.–This relieves system pressure and allows for smooth draining.
  2. Drain the Coolant: Find the coolant drain bolt at the bottom of the water pump on the right side of the engine.
    1. Place your catch pan underneath.
    2. Loosen and remove the 8mm drain bolt; coolant should flow out.
    3. If you want a complete flush, disconnect the lower radiator hose as well.
  3. Flush the System (Recommended): After draining, pour distilled water into the radiator and let it flow out the drain until clear.
    • Never use tap water—mineral deposits can damage the RM80's aluminum radiator and engine.
  4. Replace the Drain Bolt: Install a fresh washer, then torque the drain bolt snugly.
  5. Fill with Fresh Coolant: Pour new coolant into the radiator up to the filler neck.
  6. Burp the System: Start the engine briefly with the radiator cap off.
    • Rock the bike gently and blip the throttle to release air bubbles.
    • Top off coolant as needed until level stays steady.
  7. Reinstall the Radiator Cap & Clean Up: Secure the cap and wipe away any spilled coolant.
  8. Check for Leaks: Inspect the hose clamps and radiator after a short test ride. Watch for leaks or drops in coolant level.

Important Tips for RM80 Owners

  • Inspect the radiator cap seal. RM80 caps may wear out, causing pressure loss—replace if cracked or hardened.
  • Avoid mixing different coolant brands or types.
  • Properly dispose of old coolant at a local recycling center—never pour it down the drain.

Performing regular coolant changes will keep your 1989 Suzuki RM80 running at peak performance for seasons to come. If you spot damage or need upgrades, Shop parts for a 1989 Suzuki RM80 Dirt Bike. for radiators, caps, hoses & everything you need.

Related Shopping Categories

Shop Radiators for a 1989 Suzuki RM80 Dirt Bike.

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Shop Temperature Sensors for a 1989 Suzuki RM80 Dirt Bike.

Shop Tools for a 1989 Suzuki RM80 Dirt Bike.

Shop Radiator Hoses for a 1989 Suzuki RM80 Dirt Bike.

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.