How to Change the Coolant in a 2023 Beta 390 RR Race Edition

Shop parts for a 2023 Beta 390 RR Race Edition Dirt Bike.

The 2023 Beta 390 RR Race Edition stands out for its competition-grade engineering: a Beta-built single-cylinder 4-stroke engine with titanium intake and exhaust valves, sophisticated liquid cooling, and electric start complemented by a back-up kick starter. Maintaining optimal coolant is key to preserving engine performance, especially with the high compression ratio (12.48–1) and the rigorous riding this model is designed for.–

Tools & Supplies You'll Need

  • Phillips screwdriver
  • Socket set (8mm/10mm recommended)
  • Catch pan
  • Coolant rated for aluminum and modern off-road engines
  • Funnel and clean rags
  • Distilled water (optional for flushing)
  • Safety gloves

Step-by-Step Coolant Replacement Procedure

  1. Cool the Bike Completely: Let the engine cool for at least 30 minutes to avoid burns and pressure release.
  2. Remove Skid Plate (if equipped): Unscrew the skid plate for unimpeded access to the water pump and drain bolt.
  3. Locate the Radiator Cap: Find it on top of the right radiator. Remove gently to release residual pressure.
  4. Drain the Old Coolant: Position the catch pan below the water pump on the lower left side. Use the proper socket to remove the drain bolt (always inspect the copper washer for reuse or replacement). Allow coolant to drain fully. 
  5. (Optional) Flush the System: For best results, pour distilled water through the radiator and allow to drain. Repeat until clear. Replace the drain bolt and torque to factory spec.
  6. Refill Coolant: Slowly pour fresh coolant into the radiator via a funnel. The 390 RR Race Edition radiator system capacity is moderate given the engine displacement (385.6 cc). Fill to the base of the neckdo not overfill.
  7. Bleed Air: Lean the bike side to side several times, then gently tap the hoses and radiator to help release trapped bubbles.
  8. Replace Radiator Cap: Confirm that the rubber gasket is clean – reinstall the cap.
  9. Run and Check: Start engine briefly and idle, checking for leaks and monitoring the temperature gauge. Shut down and recheck coolant level once the system has circulated fluid.
  10. Replace Skid Plate: Reinstall and torque hardware as needed.

Model-Specific Owner Tips

  • The 390 RR Race Edition features a cooling fan and robust radiator design—ideal for technical terrain but susceptible to mud clogging. Clean radiator fins regularly and avoid pressure washing sealed connectors.–
  • This model is fuel injected and competition-designed, so always use coolant that meets racing standards and is compatible with magnesium and aluminum parts.
  • Never use hard water, as mineral deposits can impair heat transfer in the radiator core.
  • Monitor coolant levels before each ride—especially for hard enduro use, since overheating risks on high-compression engines are elevated.–
  • If you encounter persistent overheating despite fresh coolant, inspect for trapped air, worn radiator cap, damaged hoses, or a faulty cooling fan relay.
  • Your 390 RR Race Edition is optimized for performance but "competition use only," so diligent maintenance yields tangible longevity in engine and cooling system health.–

Final Notes

  • Dispose of old coolant responsiblynever pour into drains or onto soil.
  • Record service in your maintenance log to protect warranty eligibility.

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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.