How to Change the Oil in a 2006 GAS GAS EC 250: The Complete MotoSport.com Guide

Shop parts for a 2006 GAS GAS EC 250 Dirt Bike.

Keeping your 2006 GAS GAS EC 250 in top shape means performing regular oil changes. Proper oil maintenance keeps your two-stroke engine running smoothly, extends its life, and helps prevent costly repairs. Follow this step-by-step guide, crafted uniquely for owners of this classic enduro machine.

Tools and Supplies Needed

  • Metric socket set or T-handle wrenches (typically 8mm and 13mm)
  • Drain pan (with a large enough capacity to catch all oil)
  • Fresh 2-stroke transmission oil (consult your owner's manual for capacity and recommended type; common choices are 75W or 80W gear oil)
  • Replacement crush washer for drain bolt (recommended for each change)
  • Funnel for refill
  • Shop rags or paper towels
  • Torque wrench (optional but preferred for correct drain bolt torque)
  • Gloves (to keep your hands clean)

Preparation

  • Start your bike and let it idle for 2-3 minutes. Warm oil drains more completely and carries more contaminants away.
  • Set the bike on a stable stand so it is upright and level. Avoid using a traditional triangular stand, as it may block the drain plug access or cause the bike to tilt, trapping old oil inside the transmission case.
  • Clean the area around the drain plug and oil fill cap to reduce the chance of dirt entering the engine.

Step-by-Step Instructions

  1. Locate the Oil Drain Plug
    • The drain plug is typically located on the bottom right side of the transmission case, beneath the footpeg area.
    • Place the drain pan underneath the plug before proceeding.
  2. Remove the Drain Plug
    • Carefully loosen and remove the drain bolt using your socket or wrench.
    • Allow all oil to drain into the pan; lean the bike side to side gently to ensure complete drainage if needed.
    • Inspect the old oil for signs of metal particles or abnormal coloration. Excessive metal shavings may indicate internal wear that should be addressed.
  3. Replace the Crush Washer
    • Remove the old crush washer from the drain plug and install a new one. Using a fresh washer ensures a tight, leak-free seal once reinstalled.
  4. Reinstall the Drain Plug
    • Thread the plug in by hand first, then tighten with a wrench.
    • Recommended torque is typically around 10–15 ft-lbs (consult your service manual for the exact value for 2006 EC 250).
    • Do not overtighten; you risk stripping the aluminum threads.
  5. Pour in Fresh Oil
    • Remove the transmission oil fill cap, usually located above the clutch cover on the right side.
    • Insert a funnel and pour in the manufacturer-recommended amount and type of oil (most two-stroke EC 250 models require approximately 0.75L–0.8L, but check your manual for precise capacity).
  6. Reinstall the Fill Cap and Check for Leaks
    • Wipe up any spills.
    • Start your engine and let it idle for a minute.
    • Shut down the engine and inspect the drain bolt for leaks.
    • After a short ride, recheck your transmission oil level using the oil level check screw if equipped, or sight glass if your model has one.

2006 GAS GAS EC 250 Specific Call-Outs

  • Oil Type: The EC 250 uses a separate gearbox lubricant; do not use engine oil or four-stroke oils. Recommended: quality 75W or 80W gear oil designed for two-stroke transmissions.
  • Oil Capacity: Most commonly 0.75L to 0.8L, but verify in your manual. Overfilling can cause clutch drag; underfilling risks damage.
  • Drain Plug Access: As with KTM and Husqvarna, older EC models may have limited clearance to the drain bolt when on some stands. Use a stand that doesn't block the drain area for an easier change.
  • No Oil Filter Change: The two-stroke EC 250 does not use a replaceable oil filter in the transmission system — only in the crankcase side of four-strokes.
  • Inspect the Drain Bolt Magnet: If equipped with a magnetic drain bolt, clean off any metal particles. A large buildup could indicate transmission wear.

Pro Tips for Your Oil Change

  • Dispose of used oil responsibly: Take it to an authorized recycling center.
  • Cleanliness is critical; even small debris can cause transmission or clutch issues.
  • Keep a log of your maintenance dates/mileage to track when your next change is due.
  • If you're riding in harsh conditions (mud, water crossings, racing), change oil more frequently.

Why This Matters

  • Changing the gearbox oil in your 2006 GAS GAS EC 250 is quick, simple, and directly tied to your bike's performance and reliability.
  • Proper lubrication ensures strong clutch engagement, smooth shifting, and longer internal life for gears and bearings.

Final Check

  • After each change, monitor for leaks at the drain bolt and around the fill cap.
  • If you notice milky oil, water may be entering—inspect seals and fix promptly.

Trust MotoSport.com for your next oil change and all your two-stroke maintenance needs. Keeping your EC 250 running strong means more time on the trails and less in the shop.

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Shop Oil Fillers and Drain Plugs for a 2006 GAS GAS EC 250 Dirt Bike.

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.