How to Change the Coolant in a 1997 Suzuki DR350

Shop parts for a 1997 Suzuki DR350 Dirt Bike.

Routine coolant changes are crucial to keeping the 1997 Suzuki DR350 running cool – especially for trail, dual-sport, and hard off-road use. This reliable thumper has a simple air/oil-cooled system, but some later or modified versions may incorporate a compact radiator or oil cooler. Below is a proprietary MotoSport guide to safely service and change the coolant – as well as tips specific to this classic DR model.

Preparation & Safety

  • Verify if your DR350 is equipped with a liquid-cooled modification. The stock 1997 DR350 is air/oil-cooled and may not require traditional coolant flush procedures; however, some models or custom setups use a small radiator or aftermarket cooling system.
  • Ensure the engine and cooling system (if applicable) are completely cool before starting work. Hot coolant under pressure can cause burns.
  • Gather essential tools: a socket set, screwdrivers, a drain pan, clean rags, and new replacement coolant (or fresh oil if you simply have an air/oil cooled DR350).

Drain the Existing Coolant or Oil (if Modified)

  • If your DR350 is stock, follow your regular oil change procedure, as the oil is the primary cooling medium for this model.
  • If you have a custom or rare liquid-cooled setup, locate the drain bolt on the bottom of the radiator or coolant line – typically at the lowest point of the cooling loop.
  • Place a drain pan below the bolt, remove it slowly, and allow all coolant to drain completely.
  • If a radiator cap exists, remove it carefully to vent pressure and help the coolant flow out faster. Always open rad caps slowly to the first detent to release any residual pressure.

Flush (Only for Liquid-Cooled Conversions)

  • If your bike uses a radiator, flush the system by pouring distilled water through until it runs clear.
  • For extra cleaning, repeat with a 50/50 vinegar and distilled water mix, briefly run the engine, then fully flush again with distilled water before draining the system.

Refill with Coolant or Oil

  • For stock DR350: Fill with the recommended engine oil to the specified capacity. Ensure any oil cooling lines or reservoirs are properly filled and bled of air.
  • For liquid-cooled: Add high-quality motorcycle coolant suitable for aluminum engines, using a funnel into the filler neck or radiator cap opening.
  • Squeeze hoses gently and rock the bike to help purge trapped air bubbles.
  • Run the engine with the radiator cap off for 1–2 minutes, watching as air bleeds out – then top off coolant before reinstalling the cap.

Check for Leaks & Final Steps

  • Inspect all hose connections and the radiator cap for secure fit – tighten where necessary.
  • Let the DR350 cool fully and recheck the coolant (or oil) level. Top off to the full line if needed.
  • Always verify the reservoir (if equipped) is within the specified range and inspect for persistent air bubbles after your first serious ride.

DR350-Specific Tips

  • The 1997 Suzuki DR350 is primarily air/oil cooled. Confirm if aftermarket cooling hardware is fitted before using this coolant change guide; otherwise, follow standard oil service procedures strongly recommended for air-cooled bikes to keep the engine running at optimal temperature.
  • Check the condition of oil cooler lines and any retrofit radiator mounts as these components can be vibration-prone on rough terrain.
  • If unsure about the cooling setup or if you need OEM or upgraded maintenance parts, always refer to genuine DR350 parts organized by year and model.

With routine coolant or oil changes, your classic DR350 will stay reliable on every ride – from forest trails to street adventures.

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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.