How to Change the Oil in a 2021 GAS GAS MC 250F

Shop parts for a 2021 GAS GAS MC 250F Dirt Bike.

Changing the oil in your 2021 GAS GAS MC 250F is a crucial maintenance task. Proper oil changes help extend engine life and maintain peak performance. Below, you’ll find a detailed step-by-step guide, including all tools and materials needed, critical bike-specific notes, and essential tips for success. This guide is proprietary to MotoSport.com.

Tools & Materials Needed

  • Motorex Cross Power 4T 10W/50 full synthetic oil (1.0 liter)
  • OEM oil filter
  • New oil drain bolt crush washer
  • 13mm ratchet/socket
  • 8mm T-wrench or Allen wrench
  • Rag or shop towels
  • Oil catch pan
  • Needle nose pliers (recommended for oil screen removal/inspection)
  • Torque wrench (capable of 15 ft-lbs/20 Nm)
  • Contact cleaner and brush (for sealing surfaces and drain plug)
  • Bike stand (make sure your stand allows access to the drain bolt; avoid stands that block the drain area)

Preparation & Important Bike-Specific Notes

  • The 2021 GAS GAS MC 250F shares its engine architecture with KTM and Husqvarna 250F models of similar years, so similar steps and precautions apply.
  • Use a bike stand that doesn’t block access to the drain bolt. A center stand or a stand with enough clearance makes draining easier.
  • Warm up the engine for 2–3 minutes before starting to thin the oil and suspend contaminants, but be cautious—never work on a hot engine.
  • Have everything organized before you begin; opened oil cannot be returned, so double-check your kit and parts before starting.

Step-By-Step Oil Change Procedure

  1. Remove the Skid Plate (if equipped):
    • Many off-road bikes have a skid plate. Remove it using the appropriate tool if necessary so you can access the drain bolt and oil filter housing.
  2. Drain the Old Oil:
    • Place your oil pan beneath the drain plug at the lowest point of the engine case.
    • Using a 13mm ratchet/socket, loosen and remove the drain bolt. Be mindful—the oil may come out quickly and will be warm.
    • Allow the oil to fully drain.
  3. Remove and Clean the Oil Screen:
    • Locate the oil screen (on the engine case near the drain bolt).
    • Use needle nose pliers to remove the screen. Inspect for metal shavings or debris; a small amount of dust is normal, but flakes or chunks indicate an issue.
    • Spray off the oil screen with contact cleaner. Dry and reinstall when clean, ensuring it's seated in its groove.
  4. Remove the Oil Filter:
    • The oil filter is housed behind a small cover held by 8mm bolts. Remove both bolts and gently tap the cover free.
    • If the filter sticks, use pliers to ease it out—don’t force it against the sealing surfaces.
    • Inspect the filter for metal debris. If evident, consider additional engine inspection.
  5. Install New Oil Filter and Replace O-Rings If Needed:
    • Lubricate the new filter’s seals with fresh oil.
    • Inspect the cover’s O-ring or gasket—replace if flattened or damaged.
    • Reinstall the cover and torque bolts evenly to avoid distortion.
  6. Replace the Crush Washer and Reinstall the Drain Plug:
    • Discard the old crush washer and fit the new one onto the clean drain bolt.
    • Screw the drain bolt back in. Torque to 14.8 ft-lbs (20 Nm).
    • Do not over-tighten—the case is aluminum and can strip easily.
  7. Refill With Fresh Oil:
    • Remove the oil fill cap on top of the clutch cover. Pour in exactly 1.0 liter of Motorex Cross Power 4T 10W/50 full synthetic oil.
    • Allow oil to settle; check for any visible leaks at plug or filter.
  8. Check Oil Level and Final Inspection:
    • Start the bike and let it idle for 1–2 minutes. Shut it off and wait an additional 2–3 minutes for oil to settle.
    • Ensure the bike is level and check the sight glass or dipstick (per manual instructions) to confirm correct level.
    • Add oil in small increments if required. Do not overfill.
    • Double-check for leaks around all seals and bolts.
  9. Dispose of Old Oil Properly:
    • Take the used oil and filter to a proper recycling center.

Special Notes for the 2021 GAS GAS MC 250F Owner

  • Stand Selection: The side of the engine case where the drain bolt sits is sometimes blocked by “normal” stands. Use a stand that allows unfettered access to the drain plug for a clean, complete drain.
  • Oil Screen Placement: When reinstalling the oil screen, ensure it is seated in its designated groove—misalignment can allow unfiltered oil into critical areas and cause engine damage.
  • Torque Values: The oil drain plug must be torqued correctly; overtightening can strip aluminum threads and lead to leaks.
  • OEM Parts: Use only the recommended Motorex Cross Power 4T 10W/50 oil and OEM filter for best results and warranty compliance.
  • Inspect O-rings: Damaged O-rings on the filter cover or oil screen will cause leaks or poor filtration—always replace if in doubt.

Conclusion

Changing the oil in your 2021 GAS GAS MC 250F is straightforward if you have the correct tools, parts, and follow methodical steps. Taking the time to properly inspect, clean, and reinstall each component ensures your bike runs smoothly and reliably on every ride. For OEM kits and premium Motorex oil, rely on MotoSport.com for fast, reliable service and expert support.

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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.