How to Change the Coolant in a 2013 Suzuki DRZ400S

Shop parts for a 2013 Suzuki DRZ400S Dirt Bike.

Regular coolant changes keep your DRZ400S running cool and prevent costly engine damage. The following guide gives you a step-by-step, MotoSport-proprietary process tailored for DRZ400S owners – highlighting crucial maintenance notes for this specific model.

Tools & Supplies Needed

  • Socket set (at least 10mm, 12mm)
  • Phillips screwdriver
  • Fresh 50/50 pre-mixed motorcycle coolant (never just water or car antifreeze)
  • Drain pan
  • Protective gloves & shop towel

Step 1 – Prep the Bike

  • Park on a level surface and let the engine cool completely.
  • Remove the right side fairing or plastic (usually two to three fasteners) for easier access to the radiator and water pump area.
  • Locate the radiator cap on the right top of the radiator.

Step 2 – Drain Old Coolant

  • Place your drain pan under the water pump cover on the lower right side of the engine.
  • Remove the 10mm drain bolt at the bottom of the water pump cover. Let coolant drain fully – open the radiator cap to speed up flow.
  • Check for any debris or corrosion on the drained coolant, which can indicate issues.

Step 3 – Flush the System (Optional but Recommended)

  • If switching coolant types or if old coolant is contaminated, flush the system by pouring distilled water into the radiator, reinstalling the drain bolt, and running the engine briefly, then re-draining.

Step 4 – Reinstall Drain Bolt and Start Refilling

  • Reinstall the water pump drain bolt and tighten snugly (do not over-torque or strip the threads).
  • Check the condition of the radiator cap – replace if the gasket is worn out.

Step 5 – Bleed Air: The DRZ400S Quirk

  • Fill the right radiator slowly with coolant until nearly full.
  • On the DRZ400S, some bikes have a small bleed screw on the top front of the cylinder head (water neck) and another on the left radiator. Open each bleed screw a few turns; do not remove them completely.
  • As you add coolant, trapped air will escape from these screws. Once a steady stream of coolant flows from each, tighten their screws securely.
  • If your bike lacks a bleed screw, lean the bike left and right and gently squeeze the radiator hoses to burp out any air pockets.

Step 6 – Final Top Off & Cap Installation

  • Continue filling the radiator until full – a little at a time. Top off the overflow reservoir to the correct line.
  • Install the radiator cap.

Step 7 – Warm Up & Recheck

  • Start the engine and let it reach operating temperature while watching for leaks.
  • After cooling down, inspect coolant levels again and add as needed (repeat air bleeding if necessary).

DRZ400S-Specific Tips & Reminders

  • The 2013 DRZ400S has a robust cooling system but is sensitive to air pockets—be meticulous about bleeding the system.
  • If you trail ride or dualsport in warmer climates or at slow speeds, consider high-performance coolant for added protection.
  • Overfilling or underfilling the overflow tank can cause issues—aim for the correct level marked on the reservoir.
  • Perform a coolant change annually or after any incident where dirt or oil may have contaminated the system.

Your 2013 Suzuki DRZ400S will thank you with reliable, cool performance no matter the trail. MotoSport has all the parts and service items you need for this essential maintenance – keep your bike adventure-ready year-round.

Related Shopping Categories

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Shop Radiator Hoses for a 2013 Suzuki DRZ400S 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.