How to Change the Coolant on a 2019 Beta 390 RR-S

Shop parts for a 2019 Beta 390 RR-S Dirt Bike.

The 2019 Beta 390 RR-S stands out in the dual-sport market, combining street legality with world-class off-road capability. Keeping your bike’s cooling system in prime condition will preserve the remarkable performance Beta is known for, especially under demanding trail conditions. Here’s a proprietary MotoSport guide on how to change the coolant, with tips specific to this model.

Why Coolant Maintenance Matters

The 390 RR-S uses a liquid-cooled engine designed for high temperatures, whether riding enduro, dual-sport, or tackling trails. Old or low coolant risks overheating, reduced engine life, and performance loss. The cooling system requires particular attention if you regularly ride in extreme conditions or accumulate hours rapidly.

What You Will Need

  • Quality coolant compatible with aluminum and magnesium engine components (Beta recommends non-silicate anti-freeze; check manual for exact specs)
  • Basic hand tools (8mm socket, flathead screwdriver, funnel, catch pan, rags)
  • Distilled water (for flushing, not tap water)
  • Protective gloves

Preparation Steps

  • Park your 390 RR-S on a stable, level surface. Allow the engine to cool completely to avoid burns.
  • Remove the seat for easier access–the Beta’s push-button seat system should make this a quick task.
  • Remove the radiator shrouds using your 8mm socket (if needed for radiator cap access).

Draining the Old Coolant

  • Locate the radiator cap (right side, top of radiator) — remove it slowly to release pressure.
  • Find the coolant drain bolt on the lower water pump cover (typically right side of engine). Position your catch pan underneath and remove the bolt to drain the coolant.
  • If thorough flushing is desired, reinstall the drain bolt, fill system with distilled water, run engine briefly, let cool, and repeat drain.

Filling with New Coolant

  • With the drain bolt securely reinstalled, pour the new coolant slowly into the radiator fill neck. Fill to just below the bottom of the fill neck.
  • Lean the bike gently side to side and squeeze the radiator hoses to help purge trapped air.
  • Replace radiator cap securely. Reinstall radiator shrouds and the seat.

Bleeding Air from the System

  • Start the engine and let it idle. As it warms, gently blip the throttle a few times. Watch coolant level and top off if needed.
  • Check for leaks at the drain plug and hoses.
  • After your first ride, recheck coolant level – Beta bikes typically purge any remaining air on the first thorough heat cycle.

Model-Specific Tips for the 2019 Beta 390 RR-S

  • This RR-S uses ZF Sachs suspension and a unique chassis, so always reinstall plastics carefully to avoid interfering with hoses or suspension components.
  • The stock cooling fan (if equipped) is essential for slow trail work. Check its operation any time the system is drained or serviced.
  • The engine uses a lightweight, high-performance build; always fill only with coolants suitable for magnesium and aluminum blocks to prevent corrosion.
  • If your bike is equipped with a Trail Tech digital gauge (standard equipment on many RR-S models), you can monitor coolant temperature after service for peace of mind.

Final Checks

  • Ride gently and monitor engine temperature on your first trip.
  • Inspect for leaks and verify coolant level again after your next cool-down–topping off as needed.
  • Record the service in your maintenance log–routine coolant changes help protect your Beta’s robust engine for years to come.

Related Shopping Categories

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Shop Radiator Hoses for a 2019 Beta 390 RR-S 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.