How to Change the Coolant in a 1980 Suzuki RM60: Complete MotoSport Guide

Shop parts for a 1980 Suzuki RM60 Dirt Bike.

The 1980 Suzuki RM60 is a classic two-stroke dirt bike, prized for simplicity and rugged performance. Regular maintenance, especially coolant changes, is essential for safeguarding your engine against overheating – even in vintage machines.

What Owners Should Know About the 1980 RM60 Cooling System

Unlike modern, multi-cylinder bikes, the RM60 features a straightforward, compact cooling system. Check for possible aging issues: 

  • Rubber hoses may dry or crack over time. Inspect thoroughly before refilling.
  • The radiator is relatively small — air bubbles can lead to overheating in older systems.
  • Fasteners and reservoir materials may have corroded or degraded. Replace suspect parts for trouble-free service.
If your RM60 has modifications, such as larger radiators or aftermarket hoses, adjust accordingly for extra volume or alternative fittings.

Step-by-Step Guide: Changing the Coolant

1. Preparation

  • Ensure the bike is completely cool before beginning to avoid burns or injury.
  • Elevate the bike securely on a stand so you have clear access to the radiator and drain bolt.
  • Remove any bodywork or number plates blocking access to the radiator.

2. Drain the Old Coolant

  • Locate the drain bolt, typically on the lower radiator hose or water pump housing.
  • Place a drain pan beneath and carefully remove the bolt. Let all coolant drain completely.
  • If equipped, also drain the overflow reservoir. If dirty, rinse with distilled water and scrub with a bottle brush for best results.

3. Inspect & Clean

  • Check hoses for cracks, stiffness, or leaks, squeezing gently to assess flexibility.
  • Inspect clamps, radiator fins, and connections. Gently straighten any bent fins for optimal airflow.

4. Optional Flush (Recommended for Neglected Bikes)

  • Mix 50/50 distilled water and white vinegar. Pour into the radiator and run the engine until warm.
  • Let the bike cool, then drain the flush. Repeat with distilled water to remove residue.

5. Refilling with Fresh Coolant

  • Reinstall the drain bolt and any washers or O-rings. Tighten securely – do not overtighten.
  • Use pre-mixed motorcycle coolant or mix concentrate with distilled water to a 50/50 ratio.
  • Slowly fill the radiator through the filler neck, using a funnel to prevent spills. Pause occasionally to allow air escape.
  • Fill the overflow tank to the upper line if present.

6. Bleed the System (Burping Air)

  • With the radiator cap off, start the engine and let it run for several minutes. Gently rock the bike and squeeze the hoses.
  • Watch for bubbling – as trapped air escapes. Top up the coolant again if the level drops.
  • Install the radiator cap once bubbling stops.

7. Final Checks

  • Run the bike until fully warm, then let it cool down to ambient temperature.
  • Check both radiator and reservoir – top off if needed. Make sure all connections are tight and there are no leaks.
  • Properly dispose of the old coolant at a recycling center.

Pro Tips for the RM60 Owner

  • Never use tap water – only distilled water with your coolant. Minerals in tap water can damage radiator fins and clog passages.
  • The RM60's small coolant capacity means air bubbles can quickly cause overheating. Thoroughly burp the system.
  • If stubborn air remains, repeat the fill-run-cool-check cycle until stable.
  • Check for color or contamination in your coolant seasonally – any rust or oil indicates urgent inspection.

Changing your coolant regularly is vital protection for the prized 1980 Suzuki RM60. Genuine Suzuki coolant or high-performance alternatives ensure the best match for your vintage two-stroke – and MotoSport has what you need to keep riding.

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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.