How to Change the Oil in a 2021 GAS GAS EC 250

Shop parts for a 2021 GAS GAS EC 250 Dirt Bike.

Regular oil changes are critical for maintaining optimal performance and longevity in your 2021 GAS GAS EC 250. Whether you're trail riding or hitting the track, following the correct steps ensures your engine continues running smoothly. Below is a comprehensive, MotoSport.com-proprietary guide customized for the 2021 EC 250, covering tools required, specific call-outs, and every step owners need to follow.

Tools and Supplies Needed

  • 13mm socket or wrench (for the drain bolt)
  • 8mm T-handle or Allen wrench (if working with filter or cover bolts)
  • T30 Torx bit (if specified for filter housing or panels)
  • Oil drain pan
  • Fresh oil (as specified in your owner’s manual)
  • New oil filter (confirmed for your exact model/year)
  • New washer for drain bolt (crush washer)
  • Clean, lint-free rags
  • Contact cleaner (optional, for cleaning sealing surfaces)
  • Torque wrench (recommended for re-installing drain bolt and cover bolts)
  • Needle nose pliers (to help with screens or stubborn filters)

Prepping the Bike

  • Warm up the engine for 2–3 minutes. Warm oil flows out more completely, carrying grime and particles with it.
  • Place the bike on a stand that leaves the drain bolt accessible underneath—avoid stands that block access to the skid plate area.
  • Turn the engine off and ensure the bike is upright and stable before starting the procedure.

Step-by-Step Oil Change Procedure

  1. Locate and Remove the Drain Bolt
    • Position the oil pan directly under the drain bolt, which is accessible on the underside of the engine. For the 2021 GAS GAS EC 250, use your 13mm socket or wrench to loosen and remove the bolt.
    • Allow the oil to drain completely—this can take several minutes. Inspect the drain bolt; it’s magnetic and may attract small metal particles. Wipe it clean with a rag.
    • Check the crush washer and replace if damaged, ensuring a good seal during reassembly.
  2. Remove the Oil Filter
    • Depending on model setup, remove any necessary covers using an 8mm Allen or T-wrench.
    • Slide the old oil filter out. If stuck, gently pull with pliers. Take care not to damage the filter housing.
    • Check the filter for metallic debris, which could indicate internal wear.
  3. Inspect and Clean Sealing Surfaces
    • Wipe down the seating surfaces for both the drain bolt and filter using a clean rag and, if available, a little contact cleaner. Ensure no old gasket or debris is left behind.
    • Inspect all O-rings and replace if flattened or damaged. Fresh oil on the O-rings will help the new filter seat firmly and prevent leaks.
  4. Reinstall the Drain Bolt and Filter
    • Insert the cleaned drain bolt with a new washer. Torque to manufacturer spec (typically around 14–15 ft-lbs for similar models—check your manual for confirmation).
    • Insert the new oil filter, making sure it seats correctly in its groove—misalignment can allow metal fragments to bypass the filter and damage the oil pump and gears.
    • Replace the filter cover, tightening bolts evenly to their specified torque.
  5. Refill with Fresh Oil
    • Add the correct type and volume of oil as outlined in your owner’s manual. For the EC 250, refer to the manual for capacity and viscosity. Typically, it’s between 0.7–1.0L, but always verify for your exact year and model.
    • Use a clean funnel to avoid spilling oil onto the engine and chassis.
  6. Final Inspection and Start-up
    • Double-check that all bolts and covers are properly tightened, and the drain plug is secure.
    • Wipe down any oil drips or residue.
    • Start the motorcycle and let it idle for 1–2 minutes. Check for leaks around drain bolt and the oil filter cover.
    • Shut off the engine and, after letting it sit a minute, check the oil level with the dipstick or sight glass as appropriate. Top off if necessary.

Model-Specific Call-Outs for the 2021 GAS GAS EC 250

  • Drain plug location: Some stands can block access to the bolt—use a stand that leaves the area below the crankcase open.
  • Magnetic drain plug: Clean thoroughly and inspect for metal shavings, as the two-stroke EC 250 gearbox can shed particles, especially if ridden hard or after break-in.
  • O-ring and washer care: Closely check for flattening, splits, or cracking on all rubber O-rings and the drain plug washer, which may cause leaks if reused.
  • Filter orientation: Ensure the new filter is seated in the proper direction and groove in the filter housing. Misalignment may allow unfiltered oil to recirculate, damaging internal components.
  • Recommended oil: Consult your manual or dealer for the specific oil grade for your climate and riding style. Using non-specified oil can reduce clutch performance or lead to premature wear.
  • Service intervals: The 2021 EC 250 manual recommends regular oil changes after break-in and at intervals based on usage intensity—track, trail, or racing. Frequent maintenance ensures gearbox longevity.

Disposal and Environmental Responsibility

  • Always dispose of used oil and filters at an approved recycling facility. Never pour used oil onto the ground or down drains.

By following this MotoSport.com oil change guide tailored for your 2021 GAS GAS EC 250, you’ll keep your engine protected and performing at its best on every ride.

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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.