How to Change the Coolant in a 2020 Beta 390 RR-S: Step-by-Step Guide
Shop parts for a 2020 Beta 390 RR-S Dirt Bike.
Fresh coolant keeps your 2020 Beta 390 RR-S engine running cool and efficient, preventing overheating and corrosion inside its high-performance cooling system. Follow this proprietary MotoSport guide to safely drain and replace your coolant like a pro, while also understanding important details unique to your Beta model.
What Makes the 2020 Beta 390 RR-S Special?
- Four-stroke, high-output engine – The RR-S line uses a performance-tuned motor requiring careful maintenance of all fluids, including coolant, for optimal endurance and reliability.
- Dual coolant drain plugs – Beta engines typically provide specific drain points in both the radiator and cylinder area, making a full coolant exchange easier and more effective for this MY.
- Premium materials – Aluminum radiators and factory hoses demand compatible, motorcycle-specific coolant formulas — avoid using automotive coolants that may contain silicates or phosphates.
Tools & Supplies Needed
- Metric socket set and wrenches
- Flat-head screwdriver
- Drain pan
- Rags or paper towels
- Funnel (optional, but recommended for refill)
- MotoSport-recommended motorcycle coolant
- Torque wrench (recommended for precision)
- Soft brush and water (for cleaning overflow or any spills)
- Safety gloves and glasses
Step-by-Step Coolant Change Instructions
-
Let Your Bike Cool Completely
Never open the radiator cap while hot. Wait until the engine is cool to the touch–this may take 30–60 minutes after use. -
Position the Bike Securely
Set your Beta 390 RR-S upright on a stand or level ground to ensure full draining. -
Remove Skid Plate or Panels (if needed)
If your model has an aftermarket or large OEM skid plate, use the correct socket to remove it for easy access to the coolant drain bolts. -
Locate Radiator and Cylinder Drain Bolts
The main radiator drain is usually found at the bottom of the left-side radiator.
The engine cylinder block drain bolt will be on the lower portion of the right engine case. -
Place a Catch Pan Below Both Drains
Use a wide drain pan to catch all coolant, reducing mess and protecting your work area or driveway. -
Open Radiator Cap
Slowly unscrew the radiator cap to allow air into the system. This helps coolant flow freely out the drains. -
Remove Radiator Drain Bolt
Using a socket/wrench, remove the radiator drain bolt and let coolant flow into the pan. Repeat for the cylinder block drain bolt.
Inspect both bolts and sealing washers for damage; replace if needed. -
Flush with Water (Optional but Recommended)
For best results, pour distilled water into the radiator and allow it to drain out completely. Repeat until clear. -
Reinstall and Torque Drain Bolts
Wipe threads and surfaces clean. Reinstall bolts, torqueing them to spec. For this Beta, 15 Nm for the engine bolt and 20 Nm for the transmission/cylinder is common – but always double-check your manual for the 390 RR-S. -
Refill with Fresh Motorcycle Coolant
Slowly pour coolant into the radiator until full. Use a funnel for accuracy. Fill until the fluid just covers the internal fins. -
Bleed Air from System
Squeeze the upper and lower radiator hoses gently by hand several times to move air bubbles toward the radiator cap. Add coolant if the level drops. -
Start Engine & Warm Up Briefly
With the radiator cap off, start the engine for 10–15 seconds. Watch for air bubbles – add coolant as necessary. Shut off, let cool, and top off one last time before securing the cap. -
Clean Up & Inspect for Leaks
Wipe away any drips. Reinstall skid plate/panels. Check all hose clamps and drain bolts for leaks after your first test ride.
Important Model-Specific Notes
- Regular coolant inspection is advised due to Beta's high-performance engine demands – off-road use accelerates wear, especially in dusty or sandy conditions.
- Follow Beta's official maintenance schedule and keep records for warranty protection. Competitive riders should monitor all fluids even more frequently.
- Never substitute automotive coolant or additives that can damage soft alloy parts or clog internal channels.
Final Tips
- Dispose of old coolant responsibly–never pour into the ground or drain. Most shops or MotoSport partners accept used coolant for recycling.
- If your coolant appears rusty, cloudy, or sludgy, inspect the system for leaks, gasket failures, or prior neglect.
Related Shopping Categories
Shop Radiators for a 2020 Beta 390 RR-S Dirt Bike.
Shop Coolant for a 2020 Beta 390 RR-S Dirt Bike.
Shop Temperature Sensors for a 2020 Beta 390 RR-S Dirt Bike.
Shop Tools for a 2020 Beta 390 RR-S Dirt Bike.
Shop Radiator Hoses for a 2020 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.