How to Change the Coolant in a 1983 Suzuki RM60: MotoSport.com Guide

Shop parts for a 1983 Suzuki RM60 Dirt Bike.

Routine coolant changes are essential to keep your 1983 Suzuki RM60 running at optimal temperature, preventing overheating and corrosion. This compact, single-cylinder two-stroke is air-cooled, which makes its maintenance slightly different from modern liquid-cooled motocross bikes–but if your RM60 has had a liquid-cooling conversion or you wish to flush and replace any auxiliary coolant for preservation, follow these steps tailored for the model.

What You Need

  • Pre-mixed motorcycle coolant (never automotive–use silicate-free for aluminum and magnesium components)
  • Distilled water (if diluting concentrated coolant)
  • Drain pan
  • Clean funnel
  • Phillips and flat screwdrivers, metric socket set
  • Protective gloves
  • Shop rags

Step 1: Preparation

  • Ensure the engine is cool to prevent burns–never open a hot radiator cap.
  • Place your RM60 on a level surface with the stand down.
  • Remove the seat and plastic tank covers if they restrict radiator or filler cap access.

Step 2: Draining Old Coolant

  • Locate the radiator cap (if equipped) and the drain bolt; for most classic conversions, the drain is on the radiator lower tank or water pump cover.
  • Position a drain pan under the bike.
  • Remove the radiator cap to allow air in and ease draining.
  • Loosen and remove the drain bolt or lowest coolant hose; let the coolant fully drain into the pan.
  • If your RM60 has an overflow bottle, unbolt and drain it as well.

Step 3: Flushing the System (Optional but Highly Recommended)

  • Reinstall the drain bolt/hose temporarily.
  • Fill the system with distilled water, replace radiator cap, and briefly start the engine for up to 1 minute.
  • Shut it down, allow cooling, then drain again, flushing any residual debris or scale.

Step 4: Refilling with Fresh Coolant

  • With the drain closed, pour pre-mixed coolant into the radiator using a funnel up to the bottom of the filler neck.
  • If required, fill the overflow reservoir to the designated line.
  • Wait a few minutes, then top up if the level drops (trapped air escapes).
  • Double-check all connections and replace radiator cap securely.

Step 5: Bleeding Air from the System

  • Start the engine and let it idle with the radiator cap off, occasionally blipping the throttle; top up as needed.
  • Once bubbles stop escaping, shut off the engine and let it cool, then recheck and top up the coolant level.
  • Replace the cap.

Step 6: Final Inspection

  • Run the engine until up to temperature; monitor for leaks or overflow.
  • Let the bike fully cool, then recheck the coolant level in both radiator and overflow.
  • Wipe up any spills and dispose of old coolant safely–never pour down the drain or onto the ground.

Notes About the 1983 Suzuki RM60

  • This model was originally air-cooled; coolant maintenance applies if your engine was swapped or fitted with an aftermarket liquid-cooling kit.
  • Inspect cylinder head and O-rings for any coolant leaks if your RM60 uses a head-jacket conversion. Many improper kits cause minor seepage around head gaskets.
  • If your RM60 is air-cooled only, there is no liquid coolant to change–basic maintenance will be cleaning the cylinder fins and checking airflow.
  • Always check the manual or any modification documentation to confirm if your specific bike is indeed liquid-cooled before proceeding.

Keep your classic RM60 running strong and cool for the track or trail. If you find damaged hoses, radiators, or want the best coolant, MotoSport stocks everything you need–don't forget to Shop parts for a 1983 Suzuki RM60 Dirt Bike..

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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.