How to Change the Coolant in a 1979 Suzuki DS80: Step-by-Step Guide

Shop parts for a 1979 Suzuki DS80 Dirt Bike.

The 1979 Suzuki DS80 is a classic, air-cooled two-stroke dirt bike that offers simple yet reliable fun for riders of all ages. While this model's air-cooled engine does not have a traditional liquid coolant system like modern water-cooled bikes, it is crucial to keep its cooling fins clean and, for models with any aftermarket or custom add-on water-cooling setup, perform regular coolant maintenance. If your DS80 is one of the rare factory or custom-converted water-cooled modelsor you're servicing another vintage Suzukifollow this MotoSport step-by-step coolant change guide.

What You Need

  • Fresh coolant recommended for motorcycles (avoid automotive coolant with silicates)
  • Distilled water
  • Drain pan
  • Socket set or screwdrivers (as required for hose clamps or radiator cap)
  • Gloves and safety glasses
  • Funnel
  • Rags or paper towels

Step 1: Prep the Bike

  • Ensure your DS80 is on a stable, level surface and engine is completely cool.
  • Remove the seat and side panels as needed for access to the radiator, hoses, or expansion tank if equipped.

Step 2: Drain the Old Coolant

  • Locate the radiator cap at the highest point of the cooling system.
  • Place your drain pan underneath the water pump or lowest coolant hose connection.
  • Slowly remove the radiator cap to release any pressure.
  • Loosen the drain bolt or remove the lowest hose to let all coolant drain fully.
  • Inspect drained coolant for any debris or signs of engine oil (milky color indicates a gasket issue).

Step 3: Flush the Cooling System

  • Reinstall the drain bolt or hose securely.
  • Fill the radiator and system with distilled water using a funnel.
  • Start the engine, allow it to idle for a few minutes (if air-cooled conversion allows), then shut off.
  • Drain the water completely; repeat if coolant was previously very dirty or if switching coolant types.

Step 4: Add Fresh Coolant

  • With the drain bolt or lowest hose in place, fill the radiator with fresh, premixed motorcycle coolant up to the base of the filler neck.
  • Slowly squeeze coolant hoses to dislodge air bubbles.
  • If your DS80 has an expansion tank, fill to the marked level.

Step 5: Bleed the System

  • Leave the radiator cap off and start the bike. Let it idle until it reaches operating temperature so the thermostat opens (if equipped).
  • Monitor coolant level—top off as needed to keep the radiator full.
  • Look for escaping air bubbles as the engine runs.
  • Once bubbles stop and coolant remains at the neck, install the radiator cap firmly.

Step 6: Final Steps & Inspection

  • Wipe away any spilled coolant, reinstall covers/seat, and verify all connections are tight.
  • Take a short test ride, then recheck coolant level after the engine has fully cooled.
  • Inspect for leaks around hoses and the radiator cap area.

1979 Suzuki DS80 Owner Notes

  • The original DS80 is an air-cooled two-stroke and does not require coolant changes under normal circumstances. This guide is for rare custom or aftermarket liquid-cooled conversions.
  • Always use bike-specific coolant—never add tap water or automotive antifreeze containing silicates.
  • For stock air-cooled models, keep engine fins clean and clear of mud or debris to prevent overheating.
  • If your bike lacks a radiator, skip fluid steps and instead focus on air cooling maintenance and cylinder cleanliness.

By following these steps, you can help ensure the longevity and reliable operation of your vintage DS80, whether stock or converted. For all parts, service items, and upgrades for your 1979 Suzuki DS80, trust MotoSport—your source for everything 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.