How to change the coolant in a 2015 Beta 390 RR Dirt Bike

How to Change the Coolant in a 2015 Beta 390 RR: A MotoSport Guide

Regular coolant changes are essential for keeping your 2015 Beta 390 RR running smoothly, especially for riders tackling tough trails or racing conditions. This exclusive MotoSport guide walks you through the whole process and highlights key tips specific to this model.

What You Need

• Fresh coolant (ethylene glycol-based, pre-mixed or mixed with distilled water as required)
• Drain pan
• 8mm socket or wrench
• Flathead screwdriver
• Shop rags
• Protective gloves

Drain the Old Coolant

• Ensure the bike is completely cool. Hot coolant can cause severe burns.
• Stabilize the bike upright on a stand for best access and to prevent spills.
• Remove the radiator cap. Use a rag to protect against any residual pressure.
• Using your 8mm socket, locate and remove the coolant drain bolt (usually on the lower water pump cover on the right side of the engine).
• Allow the old coolant to fully drain into your pan. For a better flush, gently lean the bike side-to-side.

Flush (Optional But Recommended)

• For neglected or muddy bikes, fill the system with distilled water, replace the radiator cap, and run the engine for 1-2 minutes. Drain again to ensure any contaminants are flushed out.

Refill with New Coolant

• Check that the drain bolt is reinstalled and tightened securelyreplace the washer if needed.
• Slowly pour the new coolant into the radiator until it's just above the radiator fins.
• Squeeze the radiator hoses and rock the bike gently to help purge air from the system. Unlike previous Beta models with bleeder screws, the 2015 390 RR purges air as you rock and top off through the radiator neck, so keep an eye out for the level dropping as air escapes.
• Add more coolant as required, keeping the coolant level above the radiator fins but below the filler neck.

Bleed Air & Check Levels

• Start the engine, let it idle until it warms up (about 2-3 minutes). Stop the engine and let it cool completely.
• Recheck the coolant leveltop off if necessary. Repeat the process if you notice more air escaping or the level dropping.
• Once topped off, replace the radiator cap securely.
• Double-check the reservoir tank and fill to the "max" line if needed.

Beta 390 RR Model-Specific Notes

• No bleeder screws on the radiator: Unlike older Betas, your 2015 model is designed to vent air by rocking the bike instead of using a bleeder.
• Typical coolant capacity: ~1.1-1.3 litersalways check your manual for exact specifications, and avoid overfilling.
• Inspect hoses, clamps, and the radiator for wear or leaksBeta radiators are robust but can be punctured by debris on the trail.
• If you ever see milky or rusty coolant, flush thoroughly and investigate possible internal problems before refilling.

Maintenance Tips

• Beta recommends annual coolant changes under heavy use, or at least every two years for most riders.
• Only use coolants compatible with aluminum components.
• Dispose of old coolant responsiblynever pour it on the ground or down drains.

Keeping up with coolant changes helps your Beta 390 RR stay cool, keeps internal parts protected against corrosion, and ensures maximum performance on every ride. For all the OEM and upgrade parts you might need, MotoSport has you covered.

Related Shopping Categories

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Shop Radiator Hoses for a 2015 Beta 390 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.