How to Change the Coolant in a 2013 Beta 400 RS

Shop parts for a 2013 Beta 400 RS Dirt Bike.

Regular coolant changes are essential for the longevity and performance of your 2013 Beta 400 RS. This guide from MotoSport.com offers a detailed, step-by-step approach tailored to the unique characteristics of this model, and highlights key tips for keeping your cooling system in peak condition.

Preparation – What You Need

  • Coolant specific for motorcycle aluminum radiators (pre-mixed recommended)
  • Suitable catch pan
  • Basic hand tools (socket or wrench set, flathead screwdriver)
  • Clean rags
  • Gloves and eye protection

Step 1: Safety First

  • Ensure the engine is completely cold before starting. Hot coolant can cause serious burns⚠.
  • Place the bike upright on a stable surface or center stand.

Step 2: Drain the Old Coolant

  • Locate the radiator cap. On the 2013 Beta 400 RS, you’ll find it at the top of the right-side radiator.
  • Slowly loosen and remove the radiator cap to release any residual pressure.
  • Find the coolant drain bolt. Typically, this is at the base of the water pump on the right side of the engine case.
  • Position your catch pan under the drain bolt. Remove the bolt and allow coolant to drain completely.
  • If equipped, open the radiator bleed screw (some models from these years have one) – this allows for a more complete drain.
  • Once drained, reinstall the drain bolt securely.

Step 3: Flush the System (Optional, for Thorough Maintenance)

  • Refit the drain bolt, then fill the system with distilled water.
  • Start the engine and let it idle for just a minute (do not run hot).
  • Shut off, let cool completely, and repeat the drain process above.
  • Repeat until drained water runs clear.

Step 4: Refill with Fresh Coolant

  • Pour new coolant into the radiator slowly, filling until the level sits just above the radiator fins.
  • If your model has a bleed screw, loosen it gently until coolant seeps out, then close to remove trapped air in the system. Most Beta models around 2013 have this on the right radiator.*
  • Replace and tighten the radiator cap.

Step 5: Cycle and Top Off

  • Start the bike and let it idle until fully warm—this purges air bubbles*.
  • Shut the bike off completely and let it cool down to ambient temperature.
  • Re-check the coolant level and top off as needed, ensuring it remains above the radiator fins.

Things You Should Know About the 2013 Beta 400 RS

  • This model typically holds just over 1 liter of coolant in the system.
  • A bleed screw is often included on the right side radiator for 2013 models. Use it to prevent air locks that may cause overheating.
  • Use only high-quality, aluminum-safe coolant to prevent corrosion and gasket issues—never use plain water except for rinsing during a flush.
  • Beta recommends inspecting your coolant annually and replacing it at least every two years for optimal performance and reliability.

Signs Your Coolant System Needs Attention

  • Erratic temperature gauge readings or overheating
  • Visible leaks or low fluid when cold
  • Dirty or rust-colored coolant

Maintaining the cooling system on your 2013 Beta 400 RS ensures it’s ready for any terrain, any season. Choose genuine or high-quality aftermarket parts from MotoSport and enjoy peak riding performance on every adventure.

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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.