How to Change the Coolant in a 1985 Suzuki RM80

Shop parts for a 1985 Suzuki RM80 Dirt Bike.

Keeping your 1985 Suzuki RM80 running cool is essential for top performance on the track or trail. Regular coolant changes protect your two-stroke engine from overheating and prevent costly damage from corrosion or residue buildup. This step-by-step MotoSport guide covers everything you need to know to safely and efficiently change your coolant, including important notes specific to the RM80.

Tools & Supplies Needed

  • Fresh coolant (make sure it's compatible with aluminum radiators)
  • Drain pan
  • Socket set
  • Phillips screwdriver
  • Funnel
  • Rags/shop towels
  • Distilled water (if flushing system)
  • Rubber gloves (optional)

Step 1: Ensure Safety & Prep the Bike

  • Let the bike cool completely before starting.
  • Support the RM80 securely on a stand for full access to the radiator and hoses.
  • Remove the side panels and fuel tank if they obstruct access to the radiator cap or hoses.

Step 2: Drain the Coolant

  • Locate the radiator cap on the left side of the bike. Remove it slowly to release any pressure.
  • Find the coolant drain bolt. For the RM80, it's typically on the water pump cover at the bottom right side of the engine. Place your drain pan beneath the bolt.
  • Remove the drain bolt and allow all the old coolant to flow into your pan.
  • To ensure complete drainage, tilt the bike carefully side-to-side.
  • Remove the overflow reservoir (if equipped), drain, and clean it if it's dirty or grimy.

Step 3: Inspect the Cooling System

  • While the system is empty, inspect radiator hoses for cracks, brittleness, or leaks. Replace any that feel stiff or show visible damage–hoses on older bikes like the 1985 RM80 often deteriorate with age.
  • Check hose clamps for tightness and security. Tighten as needed, but avoid overtightening which can damage hoses.
  • Examine radiator fins for bent or damaged areas and straighten them gently with a small screwdriver if necessary.

Step 4: Flush the System (Optional, But Recommended)

  • If the old coolant was dirty or if you are changing coolant types, flush the system. Replace the drain bolt, fill the system with distilled water, and run the engine for a few minutes (with the radiator cap off). Let it cool, then repeat the draining process.
  • Repeat until the water runs clear. Remove the flush water completely before adding new coolant.

Step 5: Refill with Fresh Coolant

  • Reinstall and torque the drain bolt securely.
  • Using a funnel, pour fresh coolant slowly into the radiator. Fill to the base of the filler neck.
  • If equipped, fill the overflow reservoir to the indicated level.

Step 6: Bleed and Test the System

  • Start the RM80 with the radiator cap off. Let it idle and watch for air bubbles escaping from the filler neck. Gently "burp" the system by squeezing hoses if needed.
  • Once bubbles stop and coolant level stabilizes, top off if needed and reinstall the radiator cap.
  • Let the bike fully warm up, then turn off and allow it to cool. Recheck coolant level in radiator and reservoir–top off as required.

Special Notes for 1985 Suzuki RM80 Owners

  • The compact, high-revving two-stroke motor in the 1985 RM80 runs hot and relies heavily on a clean, efficient cooling system. Always check for leaks and monitor temperatures after coolant service.
  • Older models like the RM80 are prone to hose and gasket aging, so inspect all cooling system components each time you service your coolant.
  • Use coolant marked safe for magnesium and aluminum engines to prevent corrosion in your RM80's components.
  • Change coolant every 1–2 years, or yearly for heavy race use for best protection.

Disposal & Environmental Tips

  • Never pour old coolant down the drain or on the ground–it's toxic to people and animals. Bring used coolant to a local hazardous waste facility or auto parts store for recycling.

Final Advice

Changing your coolant keeps your 1985 RM80 performing at its best and lowers the risk of overheating and engine damage. Routine maintenance is key to enjoying every ride–take the opportunity to inspect your entire cooling system each time you service it. If you notice persistent coolant loss or overheating, carefully check your radiator cap, hoses, and gaskets for leaks or wear before your next ride.

Related Shopping Categories

Shop Radiators for a 1985 Suzuki RM80 Dirt Bike.

Shop Coolant for a 1985 Suzuki RM80 Dirt Bike.

Shop Temperature Sensors for a 1985 Suzuki RM80 Dirt Bike.

Shop Tools for a 1985 Suzuki RM80 Dirt Bike.

Shop Radiator Hoses for a 1985 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.