How to Change the Oil in a 2021 Sherco 450 SEF-R

Shop parts for a 2021 Sherco 450 SEF-R Dirt Bike.

Changing the oil in your 2021 Sherco 450 SEF-R is a crucial maintenance task that ensures longevity and peak performance. This guide, brought to you by MotoSport.com, walks you step-by-step through the process, highlights specific requirements for this model, and lists the necessary tools.

Tools and Materials Needed

  • 17mm socket (for drain bolts)
  • 8mm socket (for engine case and cover bolts)
  • 4mm Allen key (for some covers and small bolts)
  • Torque wrench (to ensure bolts are tightened to manufacturer specs)
  • Oil pan (to catch used oil)
  • New oil filter (K&N or OEM)
  • New engine oil (Check manual for viscosity and quantity; use synthetic, conventional, or blend as suitable for your riding and conditions )
  • Funnel
  • Clean rags
  • Crush washers (for drain bolts; replace every oil change to prevent leaks )
  • Safety gloves

Step-by-Step Oil Change Process

  1. Warm Up the Engine

    Run the motorcycle for about 3–5 minutes. This warms the oil, allowing it to flow out more freely and carry debris with it. Shut off the engine and ensure the bike is upright and stable (use a stand).

  2. Remove Skid Plate (if equipped)

    Some Shercos come with a skid plate that might block access to the drain plug. Remove it using the appropriate socket.

  3. Locate and Remove the Drain Bolts

    The 2021 Sherco 450 SEF-R has two drain bolts on the bottom of the engine . Use a 17mm socket to remove both bolts and allow all the oil to drain into the pan.

    • Each drain bolt is equipped with a crush washer. Replace these washers every oil change to prevent leaks .
    Specific Call-out: The Sherco—s dual drain bolt setup ensures more thorough drainage; do NOT reuse old crush washers.

  4. Remove the Oil Filter

    The filter is typically behind a small cover held by two or three bolts (use an 8mm socket or 4mm Allen). Carefully remove the cover and pull out the old filter.

    • Be mindful of oil spillage when removing the filter; have rags handy.
    • Check the old filter for any metal shavings, which may indicate internal wear.
    Call-out: The 2021 Sherco 450 SEF-R uses a standard style filter, designed to work with all types of engine oil .

  5. Install the New Oil Filter

    Before installing the new filter, apply a light coat of fresh oil to the rubber O-ring for better sealing. Insert the filter, replace the cover, and tighten the bolts snugly (do not overtighten; check manual for specific torque).

  6. Reinstall Drain Plugs with New Crush Washers

    Hand-tighten both drain bolts, then use a torque wrench to tighten to factory specification (typically 10 Nm/7.3 ft-lbs, but confirm with your service manual ).

  7. Pour in New Engine Oil

    Using a funnel, fill the engine with the quantity and type of oil specified in your owner’s manual. Wipe any spills immediately.

    • Check oil level at the sight glass or dipstick (if equipped), add oil if needed, and ensure it’s between the min/max marks.

  8. Start the Engine and Check for Leaks

    Start the motorcycle and let it idle for two minutes. Shut it off, wait a minute, then recheck the oil level and inspect drain plugs and filter area for leaks. Add oil if necessary.

  9. Reinstall Skid Plate

    If removed earlier, reinstall the skid plate to factory torque specs.

  10. Proper Disposal

    Dispose of used oil and filter at a motorcycle shop or auto parts store with recycling capability.

2021 Sherco 450 SEF-R Specific Tips and Call-Outs

  • This model requires two drain bolts to be removed for a thorough oil change .
  • Crush washers are required on both drain bolts and must be replaced every time to prevent oil leaks .
  • Use oil and filters specified for your Sherco; aftermarket options like K&N for the oil filter are fully compatible .
  • Avoid overtightening any bolts. Use a torque wrench specifically for the oil filter cover and drain bolts to prevent stripping threads .

Final Check

  • Oil changes should be performed regularly as specified in your manual, or more often in racing/extreme conditions.
  • Always use the correct grade and volume of oil; using incorrect oil can lead to premature engine wear.
  • Check for leaks a second time after your next ride.

MotoSport.com stocks all the oils, filters, tools, and gear you need to keep your 2021 Sherco 450 SEF-R in perfect running order.

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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.