How to Change the Oil in a 2020 Sherco 125 SE-R

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Keeping your 2020 Sherco 125 SE-R running perfectly requires regular oil changes. Proper oil maintenance ensures optimal gearbox performance, smooth shifting, and long engine life. This step-by-step guide, proprietary to MotoSport.com, will walk you through everything you need to know, including the tools needed, best practices, and model-specific notes for the Sherco 125 SE-R.

Tools and Materials Needed

  • Socket wrench set (with metric sizes)
  • Drain pan
  • Clean funnel
  • Fresh gearbox oil (refer to the owner's manual; generally 10W-40 or as specified by Sherco)
  • Torque wrench
  • Shop rags
  • New crush washer for the drain bolt (recommended)
  • Gloves

Before You Begin

  • Warm up the bike for a few minutes to thin the oil. Make sure the engine is off and the bike is on stable, level ground with the ignition key removed.
  • For safety, work in a well-ventilated and clean area with adequate lighting.

Step-by-Step Oil Change Instructions

  1. Remove the Skid Plate (if equipped): This provides full access to the drain bolt. Use the appropriate size wrench or socket.
  2. Locate the Drain Plug: On the Sherco 125 SE-R, the gearbox oil drain plug is situated on the bottom of the engine. Double-check your owner's or workshop manual diagram if unsure (see Workshop Manual diagrams).
    Model-Specific Call-Out: The 2020 125 SE-R has a dedicated gearbox oil drain plug. Do not confuse this with any other engine or coolant drain plugs.
  3. Place the Drain Pan: Slide your oil catch pan directly beneath the drain plug.
  4. Remove the Drain Plug: Using the wrench, loosen the drain bolt counter-clockwise. Remove the bolt by hand and let the oil drain completely. This process may take several minutes.
    Important: Inspect the old oil for metal shavings or debris, which could indicate internal wear.
  5. Check and Replace the Crush Washer: Always inspect the crush washer on the drain bolt. Replace it if it is damaged or flattened for a proper seal.
  6. Reinstall the Drain Plug: Once draining is complete, reinstall the drain plug with a new crush washer. Torque the bolt to the specification in your workshop manual (typically around 10–15 Nm, but confirm exact value for your bike).
  7. Add New Oil: Locate the gearbox oil filler cap on the right-side case cover. Using a funnel, pour in the manufacturer-recommended volume and type of oil (see specification chart in the manual or use 10W-40 gearbox oil as a baseline).
    Tip: Add oil in small increments and check the sight glass (if available) or dipstick to avoid overfilling.
  8. Check Oil Level: With the bike upright and level, check if the oil reaches the mark on the sight glass or is at the correct level on the dipstick. Add more if needed, being careful not to overfill.
  9. Start the Engine: Let the engine idle for 1–2 minutes. Shut off the bike and re-check the oil level. Top up if necessary.
  10. Dispose of Used Oil Properly: Take the used oil to a certified recycling center or your local MotoSport.com dealer for safe disposal.

Special Considerations for the 2020 Sherco 125 SE-R

  • Drain Plug Location: The 125 SE-R gearbox has a specific drainage plug labeled in the workshop manual diagrams. Be sure to use the correct plug.
  • Oil Quantity: Refer to your owner’s manual for the exact fill quantity. Overfilling can cause excess pressure and leaks; underfilling can lead to gearbox damage.
  • Crush Washer: Sherco recommends replacing the crush washer every oil change to guarantee a leak-free seal.
  • No Engine Oil Filter: The 125 SE-R 2-stroke does not use a replaceable oil filter for gearbox oil—oil changes are the main line of defense.

Signs Your Bike Needs an Oil Change

  • Shifting becomes notchy or rough
  • Oil appears dark, thick, or metallic
  • Hours/mileage interval is reached (always follow the maintenance schedule recommended by Sherco)

Pro Tips from MotoSport.com

  • If you ride in wet, muddy, or harsh conditions, change your oil more frequently.
  • Keep a log of oil change dates and hours for better engine health tracking.
  • Always use a funnel when refilling oil to avoid spills and contamination.
  • Inspect the drain bolt threads for wear or rounding each service interval.

Final Inspection

  • Check tightness of the drain bolt and filler cap.
  • Look for leaks after your first ride post-change.
  • Make sure the oil level remains consistent over subsequent rides—unexpected drops may indicate leaks or internal issues.

Follow this guide for long-lasting performance from your Sherco 125 SE-R and rely on MotoSport.com for all your OEM and aftermarket parts, oil, and maintenance needs.

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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.