How to Change the Coolant in a 2014 Suzuki DR-Z400S: A MotoSport Owner's Guide

Shop parts for a 2014 Suzuki DR-Z400S Dirt Bike.

Routine coolant changes are vital to keeping your 2014 Suzuki DR-Z400S performing at its best–especially for those who ride in demanding off-road conditions or high heat. The DR-Z400S features a straightforward cooling system, but there are model-specific notes owners should know before starting the job. Below is MotoSport's step-by-step proprietary guide to changing the coolant safely, efficiently, and with confidence.

What You'll Need

  • Socket set (including 10mm and 12mm sockets)
  • Small and medium Phillips screwdrivers
  • Drain pan
  • Pre-mixed 50/50 motorcycle coolant (silicate-free, safe for aluminum engines)
  • Optional: Compressed air (for flushing)
  • Gloves and basic cleaning supplies

1. Preparation and Safety

  • Ensure the engine is completely cool before starting. Remove the key and park the bike on a stable surface.
  • If equipped, remove the left side plastic cover using a 12mm socket. This allows easier access to the water pump and drain bolt.

2. Drain the Old Coolant

  • Loosen and remove the radiator cap to relieve any pressure (the small screw holding the cap may need to be removed first).
  • Position your drain pan under the water pump. Locate the coolant drain bolt on the water pump cover (10mm bolt) and remove it. Allow coolant to drain completely.
  • To speed and improve draining, gently lean the bike right and left to help residual coolant exit.
  • Reinstall the drain bolt and ensure it's snug (do not overtighten).

3. Bleed and Fill the System

  • Some 2014 DR-Z400S models have a bleeder screw at the radiator neck (top front of head) and on the top of the left radiator. If present, loosen these a few turns–they allow trapped air to escape as you refill.
  • Slowly pour pre-mixed coolant into the right radiator. Continue adding until coolant begins to flow from the bleeder screws, then snug them down when no air bubbles are visible.
  • Top off the right radiator until it's full.
  • With the cap off and the bike upright, gently rock the bike left and right to free any lingering air pockets. Top off again if needed.

4. Purge Remaining Air & Final Steps

  • Install and secure the radiator cap.
  • Start the engine and let it idle until it fully warms up. Watch for any leaks and keep an eye on the temperature. If the temp rises rapidly, shut off the bike and recheck for air pockets.
  • Let the engine cool, then remove the radiator cap and top off coolant if necessary. Also check and fill the coolant overflow bottle to about one inch above the bottom, ensuring room for expansion.
  • Reinstall any covers previously removed.

Specific Notes for the 2014 DR-Z400S Owner

  • Not all DR-Z400S units have both bleeder screws. If yours doesn't, carefully follow the fill procedure and be especially thorough with leaning the bike to release trapped air.
  • Never use plain tap water; always use pre-mixed high-quality coolant suitable for aluminum engines. Hard water can cause scale–harmful to this model's cooling passages.
  • Check at regular intervals for leaks or loss. A healthy DR-Z400S cooling system should remain sealed and stable.

When to Replace Coolant

  • Change coolant at least every two years, or sooner if you ride aggressively, participate in racing, or experience overheating.
  • Monitor coolant color–if it appears rusty, cloudy, or very low, change it immediately. Leaks and corrosion can quickly damage this high-revving single.

Keeping your 2014 Suzuki DR-Z400S's coolant fresh will extend engine life, safeguard performance, and give you peace of mind on every ride. Don't forget: Shop parts for a 2014 Suzuki DR-Z400S Dirt Bike. for genuine cooling system parts and top-tier service products curated for your exact MMY 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.