How to Change the Oil in a 2017 GAS GAS EC250 – MotoSport.com Proprietary Guide

Shop parts for a 2017 GAS GAS EC250 Dirt Bike.

Regular oil changes keep your 2017 GAS GAS EC250 running strong, preventing wear, corrosion, overheating, and performance issues. This step-by-step guide includes the tools you’ll need, each detailed step, and crucial EC250-specific call-outs for owners.

Tools and Supplies Needed

  • 8mm Allen wrench or T-Handle
  • 13mm socket and ratchet
  • Oil drain pan
  • Fresh transmission oil (check your owner’s manual for the exact spec and quantity, typically around 0.75L for this model)
  • Clean funnel
  • Rags for cleaning drips and surfaces
  • New crush washer (highly recommended for proper sealing)
  • Small torque wrench (helpful for proper bolt tightening)
  • Gloves

Preparation and Safety

  • Warm up the engine for a few minutes to thin the oil.
  • Shut the bike off and place it upright on a stand that leaves the drain plug accessible. Avoid stands that block access near the drain bolt, as mentioned for similar GasGas and KTM models.
  • Gather all tools and supplies before starting.

Step-By-Step Process

  1. Locate the Oil Drain Bolt
    • The drain bolt is found under the engine on the left side for the EC250. If your stand blocks the bolt or impedes draining, reposition the bike or use a different stand.
  2. Drain the Old Oil
    • Place the oil pan under the drain bolt.
    • Use the 13mm socket and ratchet to carefully loosen and remove the drain bolt. Watch for hot oil.
    • Let all the oil drain into the pan. Tilting the bike gently side to side can help evacuate old oil. Allow several minutes for thorough draining.
  3. Remove, Inspect, and Replace the Crush Washer
    • Remove the old crush washer from the drain bolt. Examine both the washer and bolt for damage. Replace the washer if flattened, deformed, or cracked—it ensures a leak-free seal.
  4. Clean and Inspect Drain Bolt Area
    • Wipe the drain bolt and mating surface with a clean rag. Check for any debris or signs of metal shavings which could indicate engine wear.
  5. Reinstall Drain Bolt
    • Thread the drain bolt (with new crush washer) by hand to avoid cross-threading, then tighten with the socket. Use a torque wrench to specification if possible (common torque: around 14.8 ft-lbs). Over-tightening can strip threads or damage the case.
  6. Add New Oil
    • Remove the oil fill bolt cap (usually on the right side of the engine case).
    • Insert a clean funnel, then pour in the recommended quantity and type of oil for the 2017 EC250 (see your manual for precise information). Overfilling can cause leaks and performance issues.
    • Wipe up any spillage immediately to avoid slippery surfaces.
  7. Check Oil Level
    • Replace the oil fill cap and wipe the dipstick (if equipped).
    • With the bike level, unscrew the cap again and check the oil level marks. Add more if needed, but stay between the minimum and maximum marks.
  8. Start the Engine and Inspect
    • Run the bike for 1-2 minutes. Check the drain plug and oil fill cap for leaks.
    • Turn off the bike and let it stand for 1 minute. Re-check oil level and top off if necessary.
  9. Dispose of Old Oil Properly
    • Take used oil to a recycling center or automotive parts store accepting oil—never dump it in the trash or down the drain.

Model-Specific Call-Outs for the 2017 GAS GAS EC250

  • The EC250 is a 2-stroke with a separate transmission oil circuit. It does not use a wet clutch/engine oil system like four-strokes, so always use oil specified for 2-stroke transmission cases, not 4T engine oil or premix oil for the fuel.
  • The oil fill and check bolts may be on opposite sides of the crankcase–use the side view window or check bolt to verify correct level after filling.
  • If your EC250 has an oil-injection system, remember this is separate from the gearbox oil described here. The oil injection reservoir is for injector oil, not gearbox/transmission oil. Do not confuse the two reservoirs or oils.
  • Many EC250s run 0.75L (750cc) of transmission oil, but always confirm with your owner’s manual before filling.
  • If you spot metallic debris when draining, more frequent oil changes and further drivetrain inspection may be necessary.

Final Tips and Best Practices

  • Change oil every 15-20 hours of riding (harder/muddy or racing? Change more frequently).
  • Always inspect drain plug O-rings and washers—replace if damaged.
  • Document your maintenance. Date, hours, and notes help you stay on top of performance and warranty needs.
  • Use only manufacturer-specified oil for best performance and clutch life.

Following this guide ensures your 2017 GAS GAS EC250 transmission runs smooth, shifts crisp, and stays protected for countless rides ahead. For premium oils, parts, and professional gear, trust MotoSport.com—the rider’s source for OEM expertise and 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.