How to Change the Coolant in a 2015 Beta 300 RR

Shop parts for a 2015 Beta 300 RR Dirt Bike.

Changing the coolant in your 2015 Beta 300 RR is essential for keeping your engine running cool, extending component life, and preventing overheating–particularly during aggressive riding or in hot conditions. Here’s a proprietary step-by-step MotoSport guide made specifically for this model, including all the unique details and expert tips you need for your Beta 300 RR.

What You’ll Need

  • New coolant (use a high-quality, premixed motorcycle coolant–Beta recommends against mixing different types)
  • Drain pan
  • Socket or spanner set
  • Clean rag
  • Funnel
  • Optional: Distilled water (for a flush between coolant types)
  • Gloves & safety glasses

Special Notes for the 2015 Beta 300 RR

  • This model does not have the radiator bleeder screw found on some older Betas. If you’ve worked on older Betas, note the bleed procedure is different for 2015 and newer.
  • Beta specifies checking and replacing coolant annually for hard use.
  • The coolant fill cap is on top of the right radiator.
  • Beta recommends the coolant level should sit just above the radiator fins when viewed from the cap opening.

Step-by-Step Coolant Change

  1. Make sure the bike is cold.
    Never open the radiator cap on a hot engine–let the bike sit until it is completely cool to avoid burns.
  2. Remove the right-side radiator cap.
    Locate the cap on the right radiator. Remove it slowly to release any built-up pressure.
  3. Find and remove the coolant drain bolt.
    The drain bolt is typically a small bolt at the lowest point of the water pump cover or the lower radiator hose. Place your drain pan underneath, then remove the bolt to drain the coolant. Allow it to fully empty.
  4. If desired, flush the system.
    If you are switching coolant types or want a cleaner result, pour distilled water into the radiator, replace the cap, and gently lean the bike from side to side before removing the drain bolt again. Repeat until only clear water comes out.
  5. Reinstall the drain bolt.
    Inspect the bolt and sealing washer. Replace if worn. Tighten the bolt securely but do not overtighten.
  6. Add new coolant.
    Slowly pour the new coolant into the radiator using a funnel. Fill until the coolant sits just above the core/fins in the radiator.
  7. Work out air bubbles.
    Gently rock the bike side to side several times. Squeeze the radiator hoses by hand to help dislodge trapped air. Let the bike settle, then add a little more coolant if needed.
  8. Replace the radiator cap.
    Make sure it is undamaged. Secure the cap tightly–the 2015 Beta 300 RR does not use a separate bleed screw.
  9. Start the engine briefly.
    Run the engine for 30-60 seconds with the bike upright and the radiator cap on. Shut it off and let it cool. Re-check coolant level–top up if it has dropped below the fins.
  10. Final inspection.
    Wipe down any spilled coolant. Inspect for leaks at the drain bolt, radiator cap, and hoses. Ride the bike gently on your next ride, checking the level once more after full heat cycles.

Pro Tips Just for Beta 300 RR Owners

  • Over-tightening the radiator cap or drain bolt is a common cause of leaks–snug is good, force is unnecessary.
  • Never mix coolant types. Use what’s recommended by Beta for best corrosion protection and sealing.
  • 2015 300 RR radiators are aluminum and can be dented–take care when wrenching or reinstalling the tank.
  • If you ever remove the tank, check hose routing for kinks or pinches upon reinstallation to avoid overheat issues.

Coolant maintenance on the 2015 Beta 300 RR is straightforward but vital for optimal trail or race performance. Following this MotoSport-exclusive guide will keep your 300 RR running strong mile after mile.

Related Shopping Categories

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Shop Radiator Hoses for a 2015 Beta 300 RR 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.