How to Change the Oil in a 2021 Beta 390 RR-S: The MotoSport Guide
Shop parts for a 2021 Beta 390 RR-S Dirt Bike!
The 2021 Beta 390 RR-S is one of the most refined street-legal dirt bikes available–lightweight, robust, and known for its separate engine and transmission oil compartments. Regular oil changes are vital to preserving engine life and ensuring the unique qualities of this model remain uncompromised. Here is MotoSport's proprietary, step-by-step oil change guide tailored specifically for your 390 RR-S.
What Makes the 2021 Beta 390 RR-S Unique?
- Separate oil circuits: The engine and transmission each have their own oil and drain bolts, requiring specific attention and separate fluid fills.
- Exact oil volumes: Overfilling or underfilling can impact performance. Always use the recommended capacities (typically 750ml each for engine and transmission).
- O-ring and filter orientation: Proper installation is crucial – neglecting O-ring replacement or incorrect filter position may cause oil leaks or starvation.
Required Tools & Parts
- 13mm socket or wrench
- 8mm socket or wrench
- Oil drain pan
- Fresh engine and transmission oil (Liqui Moly 10W-50 or recommended type)
- New oil filter and O-rings
- Torque wrench (capable of 10–20 Nm)
- Clean rags
Step-by-Step Oil Change Instructions
- Warm your engine slightly (just a couple of minutes). This helps suspend contaminants and allows the oil to drain easier.
- Remove the skid plate for access if installed.
- Place your drain pan underneath. Remove the two 8mm bolts securing the engine oil filter cover. Allow oil to drip from the filter housing.
- Pull out the oil filter and cover O-ring. Leaving the cover off assists with draining.
- Using the 13mm socket, remove the engine oil drain bolt. Allow all engine oil to drain fully into the pan.
- Remove the transmission oil drain bolt. Let the transmission oil drain completely as well.
- Inspect and replace O-rings for both drain bolts for a reliable seal.
- Reinstall drain bolts:
- Engine drain bolt: 15 Nm torque
- Transmission drain bolt: 20 Nm torque
- Install new oil filter–make sure the open end faces into the engine, the solid end faces the cover.
- Install a fresh O-ring on the oil filter cover. Reinstall the cover and tighten both bolts evenly (10 Nm torque recommended).
- Replace the filler plug O-rings if worn, then add oil:
- Engine side: 750ml
- Transmission side: 750ml
- Ensure engine/filler caps are reinstalled and tightened.
- Start the engine and let it idle for 1–2 minutes. Shut down and allow oil to settle, then check the sight glass on both sides. Oil level should be within the middle range (not above or below the sight window, with the bike upright).
- Top up if necessary to reach the correct level. Clean any spilled oil and reinstall the skid plate.
Tips for Beta 390 RR-S Owners
- Do not overfill: The correct sight glass reading is crucial–too much oil may cause increased crankcase pressure or affect clutch feel.
- Monitor levels after use: It's common for the sight glass level to drop after a ride as oil circulates; only check after sitting level and off for several minutes.
- Change O-rings each service for reliable sealing.
- If you consistently find much less oil draining out than you put in, investigate possible leaks or oil consumption issues.
For genuine Beta 390 RR-S parts and maintenance essentials, always choose MotoSport's trusted inventory. Ride with confidence – your 2021 390 RR-S will thank you with every mile.
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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.