How to Change the Coolant in a 2013 Suzuki DR-Z400SM

Shop parts for a 2013 Suzuki DR-Z400SM Dirt Bike.

Keeping the cooling system fresh is crucial for your 2013 Suzuki DR-Z400SM. Proper coolant not only helps prevent overheating during demanding rides but also protects the engine from corrosion and scale buildup. This step-by-step guide is tailored for DR-Z400SM owners and highlights a few Suzuki-specific considerations to keep your supermoto running right.

Tools & Supplies You Will Need

  • Socket set (especially 10mm and 12mm sockets)
  • Phillips and flathead screwdrivers
  • Pre-diluted 50/50 motorcycle coolant (silicate-free, phosphate-free)
  • Drain pan
  • Clean rags
  • Funnel
  • Safety gloves and goggles

Step-by-Step Coolant Change Guide

  1. Prep Your Bike
    Make sure the engine is cold. Place your DR-Z400SM on a stable stand or its kickstand.
  2. Remove Side Panels (if needed)
    To access the radiator cap and water pump, remove the left side panel and any other necessary bodywork using a 12mm socket or screwdriver.
  3. Open the Radiator Cap
    Remove the small screw securing the radiator cap if equipped, then take off the radiator cap itself. This releases pressure and allows coolant to drain smoothly.
  4. Drain the Old Coolant
    Place a drain pan under the water pump area. Locate the coolant drain bolt on the water pump cover (use a 10mm socket). Loosen and remove it, allowing old coolant to flow out completely. Remove the reservoir tank cap as well, if accessible.
    Dispose of coolant safely–never pour it down the drain.
  5. Drain the Radiator Bleed Screws
    Some 2013 DR-Z400SMs have air-bleed screws at the top of the left radiator and, sometimes, on the thermostat housing. Loosen these a few turns (do not remove fully) to help air escape.
    Note: Some bikes may lack these bleeder screws. If so, just proceed to the next step.
  6. Flush the System (Optional but Recommended)
    If changing types of coolant or after any engine work, flush with distilled water to ensure the system is clean. Repeat the draining step again after flushing.
  7. Install the Drain Bolt
    Clean the drain bolt and sealing washer. Reinstall and tighten the drain bolt securely, but do not overtighten.
  8. Fill With New Coolant
    Slowly fill the right radiator with the recommended 50/50 coolant mixture using a funnel. Stop when coolant comes out of the radiator and bleeder screws. Tighten the air-bleed screws as coolant starts to seep from them.
  9. Purge Air from the System
    Continue filling until the right radiator is topped off. Gently rock the bike side to side–this can help release any trapped air. Top off again as needed. Overfilling may lead to overflow, so monitor the level closely.
  10. Check the Overflow Tank
    Ensure the overflow tank contains about 1 inch of coolant. Reinstall caps securely.
  11. Replace Side Panels
    Secure all bodywork and panels previously removed.
  12. Warm Up & Recheck
    Start the bike and let it idle until warm (just a few minutes). Watch the temperature and look for leaks. Allow the engine to cool, then remove the radiator cap and top off if needed. Add more to the overflow tank if necessary.

Model-Specific Tips for the 2013 DR-Z400SM

  • The DR-Z400SM cooling system is sensitive to trapped air. Always prime the system thoroughly and check for air pockets.
  • Factory bikes do not have a thermostat – rapid warm-up isn't expected, but makes air purging even more important.
  • Use only silicate- and phosphate-free coolant to prevent scale in the small DR-Z radiators, which can lead to overheating.
  • DR-Z radiators are relatively exposed–inspect for bent fins or leaks while you have the panels off.

By following this guide, you can help ensure your 2013 Suzuki DR-Z400SM stays cool, healthy, and riding strong.

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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.