How to Change the Coolant in a 2017 Suzuki DRZ400S

Shop parts for a 2017 Suzuki DRZ400S Dirt Bike.

Routine coolant changes are essential for keeping your 2017 Suzuki DRZ400S running cool whether you are tackling tight trails or blasting across open terrain. This model, distinguished by its simplicity and legendary reliability, relies on regular maintenance to stay at its peak – and that includes refreshing the coolant to prevent overheating, corrosion, and engine damage. Below you’ll find an expert guide tailored specifically to the unique layout of your DRZ400S, including tips for properly bleeding the system and potential model nuances you should know.

What You’ll Need

  • Coolant – 50/50 premixed coolant preferred
  • Phillips and medium-sized screwdrivers
  • Socket set (including 10mm and 12mm)
  • Catch pan for old coolant
  • Shop towels and safety gloves

Step-by-Step Coolant Change Procedure

  • Preparation
    - Ensure the engine is cold.
    - Place your dirt bike upright on a stable stand.
    - Remove the side panel if present (socket set required for the 12mm bolt). This improves access to the radiator and water pump area.
  • Drain Old Coolant
    - Remove the radiator cap: There may be a small screw securing the cap – remove it, then unscrew and set the radiator cap aside.
    - Locate the drain bolt on the water pump cover (10mm hex), position the catch pan, and remove the bolt to let the old coolant drain fully.
    - Inspect the drained fluid for contaminants or discoloration.
  • Flush If Needed
    - If switching coolant types (e.g., from water-based to non-water-based), consider flushing the system using compressed air to remove any residual coolant. Detach radiator hoses, blow air through, then reattach.
  • Reinstall and Prepare for Filling
    - Refit the drain bolt securely.
    - Some DRZ400S models have an air bleed (vent) screw at the top front of the cylinder head (water neck) and another on the left radiator. Loosen these a few turns but do not remove them entirely; their purpose is to let trapped air escape as you refill.
  • Add New Coolant
    - Slowly pour coolant into the right radiator. As you fill, air will escape through the bleed screws – once you see coolant coming out, tighten each bleed screw.
    - Top off the radiator, filling to the base of the filler neck.
  • Settle and Burp the System
    - Lean the bike to the left and right to encourage any trapped air to rise.
    - Replace the radiator cap (and reinstall the securing screw if applicable).
    - Start the engine and let it idle for several minutes, monitoring closely to avoid overheating. As the bike heats up, air bubbles may move to the radiator; shut off, let cool, and carefully remove the radiator cap to top off fluid if needed.
  • Final Checks
    - Repeat the warm-up and refill process as necessary until the level remains consistent and no more bubbles escape.
    - Fill the overflow bottle with about 1 inch of coolant if equipped, to account for thermal expansion.
    - Double-check all bolts, hoses, and caps for tightness.
    - Reinstall the side panel.

Model-Specific Notes for the 2017 DRZ400S

  • Many 2017 DRZ400S models lack a thermostat and some may not have the water neck bleeder screw. If your water neck points straight up, you will not have either an air bleeder or thermostat. In this case, simply fill until the radiator is topped off, burp as described above, and take special care to lean the bike as much as possible during the process for full air removal.
  • This bike’s radiator system is robust but the design makes trapped air a common issue if not properly burped, especially after a full coolant change. Always check level again after initial use.

When to Replace Coolant

  • Replace coolant every 1–2 years or according to your owner’s manual and use environment.
  • Signs you need this service sooner: overheating, visible corrosion or debris in coolant, or reduced radiator efficiency.

Keep your 2017 Suzuki DRZ400S reliable and ready for any ride by completing regular coolant changes – and always use parts and supplies trusted by MotoSport for best results.

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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.