How to change the oil in a 2021 Sherco 250SEF-R Dirt Bike

How to Change the Oil in a 2021 Sherco 250SEF-R

Shop parts for a 2021 Sherco 250SEF-R Dirt Bike.

Keeping your 2021 Sherco 250SEF-R in peak condition means performing regular oil changes. Below you'll find a detailed, step-by-step guide to help you change the oil, including the specific tools you'll need and critical notes that pertain to this exact model. This guide is proprietary to MotoSport.com.

Tools and Materials Needed

• 17mm socket (for main drain plug)
• 19mm socket (for secondary drain plug)
• 8mm socket (for oil filter cover bolts)
• 4mm Allen wrench (for pre-filter housing)
• Torque wrench (for precision reassembly)
• Drain pan
• Shop rags
• New oil filter (replace every oil change)
• New O-rings (for oil filter cap and drain plug gaskets)
• 0.9 liters of SAE 10W60 engine oil (premium, high-quality)
• Replacement crush washers (for drain plugs)
• Funnel
• Gloves

Step-by-Step Instructions

1. Warm Up the Engine
   • Start the motorcycle and let it idle for 3–5 minutes. This thins the oil, making it easier to drain and ensuring contaminants are suspended.
2. Prepare the Bike
   • Place the bike upright on a stand.
   • Remove the engine guard/skid plate if installed.
   • Position your drain pan directly under the engine.
3. Drain the Engine Oil
   • Remove the engine oil filler cap (right side of the cylinder head) to allow air in and improve draining.
   • Loosen and remove drain plug 1 (main drain plug, M19, 22 Nm torque) and allow the oil to drain completely.
   • Remove the magnetic drain plug (M12, 15 Nm torque) to let any residual oil and magnetic particles out.
   • The 2021 Sherco 250SEF-R uses two drain plugs for faster and more thorough draining, both of which require new crush washers with every oil change.
   • Let the oil drip out fully before continuing.
4. Remove and Inspect the Oil Filter and Pre-Filter
   • Using an 8mm socket, remove the three bolts holding the oil filter cover.
   • Take out the oil filter, noting its orientation (install the new one the same way).
   • Remove and clean the pre-filter (screen) with a 4mm Allen wrench. Clean with solvent and dry completely before reinstalling.
   • Inspect the magnetic plug for significant metal particles—some small debris is normal, but excess may indicate engine wear.
5. Replace the Oil Filter and O-Rings
   • Install the new oil filter (in the same orientation as removed). Always use a new filter at each change—for this model, this is mandatory.
   • Replace the O-ring on the oil filter cap and on drain plug(s) as needed. Lubricate the O-rings with fresh oil before installation.
6. Reinstall the Drain Plugs and Oil Filter Cover
   • Install the drain plug 1 and torque to 22 Nm with a new crush washer.
   • Install the magnetic drain plug and torque to 15 Nm with a new crush washer.
   • Reinstall the pre-filter and oil filter cover using the 8mm socket; torque the oil filter cover bolts to 15 Nm.
7. Refill with Fresh Oil
   • Using a funnel, pour in 0.9 liters of SAE 10W60 oil as specified by the manufacturer.
   • Reinstall the oil filler cap.
   • This engine has a sight glass on the right side: oil should fall between the marks when the bike is upright.
8. Final Checks
   • Start the engine and let it run for 30–60 seconds, then turn off and allow oil to settle for 2–5 minutes.
   • Check the oil level again at the sight glass and top off as needed.
   • Carefully inspect for leaks around the filter cover and drain plugs.
   • Reinstall the engine guard/skid plate.
9. Dispose of Used Oil and Filter Properly
   • Used oil and oil filters must be taken to a certified recycling center. Never dispose of oil in drains, trash, or natural areas.

Sherco 250SEF-R Model Specific Notes

• Always replace the oil filter and pre-filter screen with every oil change. This is not optional as per the manufacturer’s instructions for this model.
• Inspect O-rings for cuts or deformities, and always use new crush washers to prevent leaks.
• This bike uses both a main and magnetic drain plug. Both must be removed, cleaned, and reinstalled with new washers every oil change.
• The specified oil capacity is 0.9 liters. Overfilling or underfilling can result in engine damage or poor performance.
• Tighten all bolts to specified torque values to avoid stripping threads or causing leaks: main drain plug (22 Nm), magnetic drain plug and oil filter cover (15 Nm each).

Frequently Asked Questions

• How often should I change my oil? Follow manufacturer’s recommendations, but most riders change the oil every 15–20 hours of use or after heavy ride events.
• What if I see metal flakes on the magnetic plug? Some fine shavings are normal with break-in and routine use, but heavy or shiny flakes require immediate engine inspection.
• Can I use another oil weight? Always use SAE 10W60 synthetic oil for best results and engine longevity.

Routine oil changes are essential to the longevity and performance of your 2021 Sherco 250SEF-R. For OEM parts, shop MotoSport.com for everything you need for maintenance and repair.

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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.