How to Change the Oil in a 2013 Beta 350 RS: Step-by-Step Guide

If you own a 2013 Beta 350 RS, regular oil changes are critical for your engine – and transmission – health. The unique design of this Italian dual-sport means you need to change two separate oil cavities: one for the engine, one for the transmission. Below you’ll find a detailed, proprietary MotoSport guide for a complete oil service that covers all the details – including torque specs and model-specific notes to keep your 350 RS running strong.

What You’ll Need

  • 13mm socket & wrench
  • 8mm socket or Allen for oil filter cover
  • Drain pan
  • 2 new oil filter cover O-rings (recommended)
  • 2 new drain bolt washers or O-rings (recommended)
  • Replacement oil filter
  • High-quality 10W-50 motorcycle oil (at least 1.5L)
  • Rags and safety gloves

Step 1: Prep the Bike

  • Warm up the engine for a few minutes. This helps oil drain quickly and removes suspended contaminants.
  • Put your Beta 350 RS on a stand, ensuring it’s secure and level.
  • Remove the skid plate (if installed) to access both oil drain bolts.

Step 2: Drain Engine & Transmission Oil

  • Place your drain pan under the bike. Remove the engine oil drain bolt (13mm) and allow oil to fully drain.
  • Locate the transmission drain bolt and remove it. Let the oil completely drain out.

Step 3: Remove and Replace Oil Filter

  • Remove the two 8mm bolts holding the oil filter cover.
  • Take out the oil filter and the cover O-ring. Let the area drain for a few minutes.
  • Install a new oil filter with the open end facing the engine. Replace the O-ring with a new one if available.

Step 4: Clean & Reinstall Drain Bolts

  • Inspect and thoroughly clean both drain bolts. Replace washers or O-rings if worn.
  • Reinstall the engine drain bolt and torque to 15 Nm.
  • Reinstall the transmission drain bolt and torque to 20 Nm.

Step 5: Add New Oil

  • Pour 750 mL of 10W-50 oil into the engine side filler cap.
  • Pour 750 mL of 10W-50 oil into the transmission side filler cap.
  • Do not rely on the check plug or sight glass immediately after the fill–the correct volume is critical on Beta 4-strokes.

Step 6: Final Checks

  • Start the engine and let it run for two minutes. Check for leaks around drain plugs and the oil filter cover.
  • Check oil levels: For the engine, ensure the level is in the middle of the sight window while running (per Beta’s design).

Important Notes for Beta 350 RS Owners

  • The 2013 Beta 350 RS has separate engine and transmission oil chambers; both must be serviced at every change for optimal performance and longevity.
  • Beta specifies checking engine oil level in the sight glass while the engine is running. This is unique compared to most dirt bike designs and ensures proper oil distribution in the system.
  • Do not use the transmission check bolt to confirm your oil level–always trust the measured 750 mL per cavity.
  • Always use oil formulated for wet clutch motorcycles (JASO MA2 spec) to prevent premature clutch wear and slippage.

Change your Beta’s oil every 10-15 hours of operation, or more frequently under extreme riding. Proper maintenance is the best way to maximize the life of your 2013 Beta 350 RS and keep it running flawlessly mile after 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.