How to Change the Coolant in a 2011 Beta 400 RS

Shop parts for a 2011 Beta 400 RS Dirt Bike.

Regular coolant service helps your 2011 Beta 400 RS perform at its best and extends engine life. The procedure outlined below is tailored to the model’s unique design, including its radiator configuration and coolant system. For this model, never open the radiator cap when the engine is hot–let it cool completely to avoid scalding or injury.

Tools & Supplies Needed

  • New coolant (use Beta-recommended or high-quality motorcycle coolant, not automotive antifreeze)
  • Drain pan
  • Funnel
  • Socket set/screwdrivers for bodywork removal (if needed)
  • Clean rags
  • Gloves & eye protection

Model-Specific Notes

  • Coolant capacity: Always check the owner’s manual for the exact volume; the 2011 Beta 400 RS cooling circuit typically holds about 1.0–1.3 liters.
  • Radiator cap location: Accessed under the shrouds. Ensure you only open the cap when cold.
  • The coolant level must immerse radiator fins by about 10 mm when cold for optimal protection.

Step-by-Step Coolant Change Procedure

  1. Let the engine cool completely before starting. Do not attempt this on a hot engine.
  2. Remove radiator shrouds if necessary for easier access to the cap and drain bolt.
  3. Place a drain pan under the water pump or bottom radiator hose area to catch old coolant.
    On the 2011 Beta 400 RS, drain either by removing the lower radiator hose or, if equipped, the dedicated coolant drain bolt found near the water pump.
  4. Open the radiator cap slowly to release pressure and remove it completely.
  5. Open the drain bolt or remove the lower hose to allow all coolant to flow out. Lean the bike side-to-side gently to assist full drainage.
  6. Inspect the drained fluid. Major discoloration or residue may indicate the need for a system flush (done by filling with distilled water, running briefly, and draining again).
  7. Refit and tighten the drain bolt or hose securely to prevent leaks.
  8. Fill the radiator with fresh coolant using a funnel, adding slowly until it covers the radiator fins by approximately 10 mm as specified.
  9. Prime the system by tilting the bike or lightly squeezing hoses to help trapped air rise to the fill neck.
  10. Replace the radiator cap securely.
  11. Start the engine and let it idle until it reaches full temperature–watch for leaks. The thermostat will open; coolant will circulate. Switch off and let cool completely.
  12. Recheck coolant level. Remove the radiator cap when cool, ensuring the level still covers the fins by about 10 mm. If needed, top up and refit the cap.
  13. Final checks: Look for leaks, and check the overflow reservoir (if fitted) for correct level. Ride short distances, let the engine cool, and verify levels again to confirm any trapped air has bled out.

Important Safety & Maintenance Tips

  • Always use motorcycle-specific coolant–never substitute with tap water, which may corrode passages or cause scaling.
  • Dispose of old coolant safely as it is toxic and harmful to the environment.
  • For most Beta dirt bikes, replace coolant every year for best results, or more frequently if riding in extreme environments.
  • If the system repeatedly needs topping off, check for hose leaks, radiator problems, or possible gasket issues.

Changing the coolant on your 2011 Beta 400 RS is straightforward and ensures reliable performance for any off-road adventure. Always check the system after the bike’s first ride post-service to make sure the cooling circuit is full and air-free–this model, in particular, benefits from careful air bleed through the radiator neck and hoses, with the cap to remain off until the system is primed and topped off cold. For specialized tools, radiators, or replacement caps, MotoSport has OEM & aftermarket options to complete the job right.

Related Shopping Categories

Shop Radiators for a 2011 Beta 400 RS Dirt Bike.

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Shop Temperature Sensors for a 2011 Beta 400 RS Dirt Bike.

Shop Tools for a 2011 Beta 400 RS Dirt Bike.

Shop Radiator Hoses for a 2011 Beta 400 RS 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.