How to Change the Oil in a 2024 GAS GAS MC85BW

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Changing the oil in your 2024 GAS GAS MC85BW is a crucial maintenance task to ensure your dirt bike’s engine and transmission continue running smoothly. This step-by-step guide, proprietary to MotoSport.com, will outline the tools required, detailed instructions, and key notes specific to the MC85BW model year. Taking time to complete each step properly will keep your bike in peak condition and help you avoid costly repairs down the line.

Tools and Materials Needed

  • 8mm T-handle or socket wrench
  • Torque wrench (Nm scale, capable of at least 15 Nm)
  • Drain pan
  • Funnel (ideally threaded or designed for motorcycle oil changes)
  • 500cc high-quality gear/transmission oil (e.g., Motul Trans Oil, Maxima MTL, etc.)
  • New crush washer (recommended for every oil change)
  • Clean shop rags
  • Parts/brake cleaner (for cleaning drain plug and area)
  • Screwdriver or brake pedal separator (may be needed for easier drain plug access)

Step-by-Step Instructions

1. Warm Up the Engine

  • Start your GAS GAS MC85BW and let it idle for several minutes to warm the oil.
  • Shut off the bike and place it securely on a stand. Warming the oil allows it to drain more efficiently.

2. Locate and Access the Drain Plug

  • Find the oil drain plug underneath the engine.
  • On the MC85BW, the drain plug may be partially obstructed by the brake pedal. If so:
    • Carefully push the brake caliper pistons in or use a screwdriver to move the brake pedal out of the way for clear access to the drain plug. This handy trick saves time and avoids unnecessary disassembly.

3. Drain the Oil

  • Position a drain pan directly beneath the drain plug.
  • Use your 8mm wrench to carefully loosen and remove the drain plug.
  • Allow all the old gear oil to fully drain into the pan. Expect approximately 500cc (about a half-liter) of oil.
  • Inspect the oil for large debris or metal shavings. Tiny, fine shavings on the magnetic plug are normal, especially after recent engine work, but chunks indicate a possible issue.

4. Clean the Drain Plug and Replace the Washer

  • Clean the drain plug thoroughly, focusing on removing any accumulated metal particles from the magnet.
  • Inspect the crush washer or copper washer. Replace it with a new one for best practice, or flip it over carefully for a second use if necessary. A sound washer is essential for a good seal and preventing leaks.

5. Reinstall the Drain Plug

  • Once the area is clean and the oil is fully drained, thread the drain plug with the washer back into place by hand.
  • Use the 8mm wrench to snug it up, then torque to 15 Nm (approximately 11 lb-ft) for the MC85BW model. Always refer to your owner’s manual for exact torque specs.

6. Fill with Fresh Gear Oil

  • Locate the oil fill cap (usually on the right-hand side of the engine).
  • Insert a funnel into the fill hole. A threaded funnel is best to avoid spills and fit the unique opening. Many riders 3D print a special funnel for a secure, spill-proof fit.
  • Pour in exactly 500cc of recommended gear oil (e.g., Motul Trans Oil or Maxima MTL). Overfilling or underfilling can affect shifting and clutch performance.

7. Double-Check for Leaks

  • Clean off any residual oil from the engine casing and drain area.
  • Start the engine and let it run for a few minutes, then inspect the drain plug and casing for leaks. Re-torque the plug if necessary but never over-tighten.

8. Proper Disposal

  • Dispose of your used oil at an approved recycling location. Never pour oil onto the ground or into household drains.

Model-Specific Call-Outs for the 2024 GAS GAS MC85BW

  • The MC85BW (Big Wheel) uses the same drivetrain and procedures as the standard MC85, so capacity and torque specs remain identical.
  • Pay special attention to the brake pedal position for easier access to the drain plug, as clearances can be tight. Use a screwdriver or pedal separator if you encounter clearance issues.
  • Always use a new or freshly flipped crush washer for sealing – leaks are commonly caused by reusing old or damaged washers.
  • Check for any model-year-specific updates in the production run—refer to your owner’s manual or dealer if unsure.

Recommended Gear Oil Types

  • Motul Trans Oil
  • Maxima MTL
  • Follow the manufacturer’s viscosity specification for your typical riding conditions.

Regular Maintenance Reminder

  • Change your transmission oil regularly, especially after hard rides or racing conditions. Oil should appear clear and free from sludge or excessive debris.

Changing the oil on your 2024 GAS GAS MC85BW takes about 20-30 minutes and can extend your bike’s engine and transmission life significantly. For high-quality parts, tools, and expert advice, trust MotoSport.com 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.