How to Change the Oil in a 2021 Beta 125 RR Race: Complete Guide

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The 2021 Beta 125 RR Race is a high-revving two-stroke that demands routine maintenance for optimum performance. One of the most crucialand satisfyingmaintenance jobs you can tackle yourself is an oil change. This model features a separate transmission oil system, and following the recommended schedule and using proper technique ensures both reliability and smooth shifting.

What You Will Need

  • 720 mL (about 24.3 oz) of 10W-50 quality transmission oil, or as marked in your manual (some recommend 690 mL – always check your owner's manual and when in doubt, fill to the proper check level)
  • Clean drain pan
  • 8 mm or 13 mm wrench or socket (verify for your bike's drain/check bolts)
  • Funnel or bottle with spout
  • Clean rags
  • Gloves

Step-by-Step Oil Change Process

  1. Warm up the engine. Run the engine for a few minutes. This helps the oil flow out smoothly and takes dirt and contaminants with it.
  2. Remove the skid plate. For easier access, unbolt and remove the skid plate if your bike is equipped with one.
  3. Locate the drain plug. On the 125 RR, the transmission drain bolt is found underneath the engine. Place your drain pan beneath and remove the bolt with your wrench. Allow the oil to completely drain.
  4. Replace the drain bolt. Once oil has stopped dripping, check the bolt and its washer for damage. Reinstall and torque to specdo not overtighten.
  5. Remove the oil fill cap. The fill cap is typically found by your right boot on the engine case.
  6. Add new oil. Using a funnel or spout, carefully pour in the specified amount of fresh transmission oil (generally 720 mL, but 690 mL may be specified for some oil brands—do not overfill)†.
    Tip: Check markings on your oil bottle to avoid overpouring.
  7. Check the oil level. With the bike perfectly level and standing upright, use the oil check bolt located just behind the brake pedal's return spring†. Remove it briefly; oil should begin to dribble out of the hole. If nothing comes out, add a tiny amount more. Once you see oil at the bolt, reinstall and torque to spec.
  8. Reinstall the skid plate. Bolt your skid plate back on, ensuring it is secure.
  9. Start and inspect. Briefly run the engine, then check for leaks at both fill and drain bolts.

Additional Tips & Notes for the 2021 Beta 125 RR Race

  • Oil capacity may vary slightly between a fully dry engine and routine changes. Always err on the side of caution and adjust via the check bolt.
  • Beta recommends changing transmission oil frequently if riding in muddy or wet conditions or after break-in periods.
  • No oil filter to replace: The 125 RR Race utilizes a simple transmission oil circuit, so there is no oil filter as you'd find in a four-strokemaking oil changes easier and faster.
  • Use only motorcycle-specific transmission oils. Automotive oils lack the correct additives for clutch and gearbox performance on two-strokes.
  • Keep records of every oil change including hours and mileage for best maintenance practices.
  • Draining tip: Removing the fill cap before draining lets oil exit quicker by reducing vacuum inside the case.
  • Beta-specific detail: The check bolt behind the brake helps avoid overfilling—unique among many dirt bikes. Always use the level check bolt, especially if you did not measure the exact amount you poured in†.

Taking care of regular oil changes on your 2021 Beta 125 RR Race keeps your transmission and clutch functioning at their best. With routine attention using correct procedures and quality parts, your Beta will keep delivering outstanding two-stroke performance ride after ride.

† Note: Engine oil capacity references and check bolt use sourced from owner maintenance experience and specifications for the Beta 125 RR Race models within the generation.

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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.