How to Change the Coolant in a 2015 Beta 390 RS

Shop parts for a 2015 Beta 390 RS Dirt Bike.

Regular coolant changes are essential for maintaining peak performance and longevity in your 2015 Beta 390 RS. This guide ensures you get it done right – tailored specifically for MMY (Make, Model, Year) Beta dirt bike owners.

Important Model-Specific Notes

  • Always check coolant when the engine is cold to avoid burns and get an accurate reading. The radiator on this model uses cap A – opening when hot is dangerous and can result in injury or damage to the bike's cooling system1.
  • For the 2015 390 RS, the coolant fill and drain points are easy to access. No bleeder screw is included, unlike older Beta models. Air is naturally purged by topping off after the engine warms up and cools again2.
  • Beta recommends specific coolants. Use the correct type and quantity referenced in your genuine owners manual for optimal performance5.
  • Wear protective gloves and eyewear; coolant is toxic and can cause skin & eye irritation5.

Step-by-Step Guide

  1. Allow the engine to cool. Never work on a hot cooling system.
  2. Locate and remove cap A on the radiator. This cap is usually found on the upper part of the radiator5.
  3. Place a suitable container beneath the engine. Position it to catch all draining coolant3.
  4. Remove the coolant drain screw. Usually located at the bottom of the water pump or one of the lower radiator hoses.
  5. Allow all coolant to drain fully. Gently rocking the bike from side to side can help release any trapped fluid2.
  6. Inspect the drain washer. Replace if damaged. Reinstall and tighten the screw to about 10 Nm3.
  7. Flush the cooling system (optional). For thorough maintenance, flush with distilled water before refilling.
  8. Carefully pour in new coolant. Fill until the liquid is visible just above the radiator fins, without overfilling2.
  9. Reinstall radiator cap. Make sure it is securely tightened.
  10. Start the engine and allow it to warm up, then shut off. This circulates coolant and releases any trapped air. Let the bike cool and re-check the level—top off if necessary.

Additional Tips for Beta 390 RS Owners

  • Check hoses and connections for leaks after each coolant change.
  • Inspect the radiator cap seal—replace if cracked or hardened.
  • Perform yearly coolant changes, or more often if you ride in extreme heat or severe conditions.

Keeping your 2015 Beta 390 RS cooling system well-maintained means more confidence on every ride. For parts, exclusive upgrades, or OEM replacements, MotoSport is your trusted source for keeping your Beta at its best.

Related Shopping Categories

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Shop Temperature Sensors for a 2015 Beta 390 RS Dirt Bike.

Shop Tools for a 2015 Beta 390 RS Dirt Bike.

Shop Radiator Hoses for a 2015 Beta 390 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.