How to change the oil in a 2021 GAS GAS EC350F Dirt Bike

How to Change the Oil in a 2021 GAS GAS EC350F

Shop parts for a 2021 GAS GAS EC350F Dirt Bike.

Keeping your 2021 GAS GAS EC350F running strong starts with regular oil changes. With high-revving four-stroke enduro engines like the EC350F, fresh oil is vital to reduce friction, protect components, and ensure reliability on and off the trails. Changing your oil at manufacturer-recommended intervals (or after any muddy, dusty, or hard riding) is a DIY task anyone can master with the right tools and know-how.

Tools and Supplies Needed

• 8mm Allen wrench (T-handle or socket)
• 8mm T-wrench (for oil filter cover bolts)
• 13mm ratchet/socket (for drain plug)
• Needle-nose pliers (for oil filter removal/replacement)
• New crush washer for the drain plug (recommended every oil change)
• New oil filter
• Replacement engine oil (consult manual for type and volume; typically about 1.1L for the EC350F)
• Oil catch pan
• Clean rags
• Bike stand (use a side-lift/triangle stand; do not use a flat stand that blocks access to the drain plug)
• Torque wrench (for OEM spec tightening, especially the drain plug)
• Parts cleaning spray (for oil screens and covers)

Step-by-Step Oil Change Procedure

1. Preparation
   • Warm up your motorcycle for a few minutes; this allows the oil to flow smoothly and carry away contaminants.
   • Set your EC350F securely on a proper bike stand. Do not use a flat stand—it can block access to the drain bolt and make draining incomplete. A triangle or lift stand is ideal.
   • Turn off the engine and let it cool slightly so you don’t risk burns.
2. Remove the Oil Filter
   • Locate the oil filter cover on the right side of the crankcase.
   • Use an 8mm T-wrench to remove the two bolts securing the cover.
   • Carefully pull the oil filter out. If it’s stuck, use needle-nose pliers or gently tap the case to work it loose.
   • Inspect the O-ring on the filter cover. Replace O-rings if damaged or flattened.
3. Drain the Engine Oil
   • Slide your oil drain pan under the engine.
   • Use a 13mm socket or Allen wrench (verify which your bike uses) to remove the main drain bolt at the bottom or rear of the crankcase.
   • Allow the oil to drain fully—rock the bike side-to-side or briefly lean gently (as shown in pro tips) to help oil flow out completely.
   • Optionally, once most oil is drained, hold down the kill switch and “crank” the starter a few times. This circulates out any remaining oil without starting the bike.
4. Clean and Inspect Parts
   • Wipe down the drain bolt and replace the crush washer (do not reuse old washers, as a proper seal is important).
   • If your EC350F has an oil screen or mesh filter (common on these bikes), remove and clean it thoroughly with parts cleaner. Carefully inspect for metal shavings—excessive particles could indicate wear.
   • Clean sealing surfaces on the filter cover and crankcase to prevent leaks.
5. Reinstall Drain Plug & Filter
   • Apply a small amount of oil to the O-rings on the oil filter and any screens.
   • Insert the main drain plug with a new crush washer and torque to OEM spec: typically about 14.8 foot-pounds for the drain plug.
   • Carefully slide in the new oil filter; make sure it sits in the groove and is not misaligned. Some owners accidentally offset the filter, which can allow unfiltered oil to circulate.
   • Install the filter cover, checking that the O-ring is properly seated.
   • Tighten the cover bolts evenly.
6. Add New Oil
   • Remove the oil fill cap (on top of the engine).
   • Pour in fresh engine oil—check your manual for the correct type and volume. For the 2021 GAS GAS EC350F, use a high-quality four-stroke motorcycle oil and fill approximately 1.1L (check the window or dipstick for confirmation).
   • Replace the oil fill cap.
7. Final Checks
   • Run the engine for 30–60 seconds to circulate new oil.
   • Check for any leaks at the drain plug and oil filter cover.
   • Turn off the bike, allow oil to settle, and check oil level with the inspection window or dipstick.
   • Top off if necessary, but do not overfill.
   • Dispose of old oil and filter responsibly at a recycling center.

GAS GAS EC350F-Specific Pro Tips and Call-Outs

• Stand Selection: Many bike stands block the oil drain bolt. Always use a triangle stand or lift that leaves the lower/rear part of the crankcase accessible.
• Oil Filter Alignment: The EC350F (like its KTM/Husqvarna cousins) uses a groove for the oil filter or screen. Double-check proper seating to avoid bypassing the filter—crucial to engine health.
• Crush Washers & O-rings: Each oil change should include a fresh drain plug crush washer and inspection of all O-rings. Replace if worn, flattened, or cracked to avoid leaks and pressure loss.
• Torque Settings: Always use a torque wrench on the drain plug (OEM spec: 14.8 ft-lbs) to prevent stripping aluminum threads or under-tightening.
• Oil Type & Volume: Use only motorcycle-specific 4T oils (such as Motorex Cross Power 4T or your favorite quality equivalent). Oil capacity is approximately 1.1 liters, but always confirm via the sight window after cycling the engine.

By following this process, you ensure your GAS GAS EC350F gets the best protection for every ride. For parts, filters, tools, and premium motorcycle oils, trust MotoSport.com—your one-stop shop for all your dirt bike maintenance needs.

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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.