How to Change the Oil in a 2020 Cobra CX50FWE

Shop parts for a 2020 Cobra CX50FWE Dirt Bike.

Changing the transmission/clutch oil in your 2020 Cobra CX50FWE is an essential maintenance task, ensuring optimal clutch performance and long engine life. This how-to guide is proprietary to MotoSport.com and tailored specifically for the 2020 Cobra CX50FWE, including required tools, steps, and crucial model-specific call-outs every owner should know.

Tools & Supplies Needed

  • 5mm Allen wrench
  • Measuring cup (marked for 300ml/10oz up to 350ml/12oz)
  • Long funnel for accurate refill
  • Oil drain pan
  • Clean shop rag or paper towels
  • Cobra Venom 3 Shoe Clutch Milk (Part #MCMUGF32) – Recommended by Cobra for best clutch and transmission protection
  • Latex/nitrile gloves (optional, for cleanliness)

Preparation & Safety Call-Outs

  • Warm the engine: Run the bike for 5-10 minutes so the oil flows easily, but avoid full operating temp to prevent burns. Let the bike cool for several minutes if it feels too hot to the touch.
  • Always work on a level surface to avoid spills and over/under-filling.
  • Never exceed 350ml (12oz) of oil in this transmission. Too much oil reduces performance, too little can damage the clutch and gears

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Step-by-Step Oil Change Instructions

  1. Get everything ready:
    • Place bike on a stand or securely balanced upright.
    • Arrange all tools and supplies within easy reach.
    • Pre-measure the oil: Fill your clean measuring cup with 300ml (10oz) of Cobra Venom 3 Shoe Clutch Milk (or up to 350ml for mildly extended clutch life)

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  2. Locate the drain plug:
    • Find the oil drain plug on the right side of the engine, just on the clutch cover near the brake lever

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  3. Drain the old oil:
    • Place your oil pan directly under the drain plug.
    • Using the 5mm Allen wrench, remove the drain plug carefully.
    • Allow all of the oil to fully drain–wait a couple of minutes for the last drops to drip out.
  4. Reinstall the drain plug:
    • Check that the plug's gasket is intact and seated.
    • Tighten the plug to hand tight, then snug it gently with the Allen wrench. Do not overtighten as you risk stripping the threads.
  5. Refill with fresh oil:
    • Remove the oil fill plug (typically located at the top of the clutch cover).
    • Insert your long funnel into the fill hole.
    • Slowly pour the measured oil (300ml to 350ml) into the transmission.
    • Replace the fill plug, ensuring its gasket is in place. Tighten to hand tight only.
  6. Dispose of the old oil responsibly:
    • Place used oil in a sealed container and take it to a recycling center or auto parts retailer that offers oil recycling.
  7. Double-check your work:
    • Inspect the area around the drain and fill plugs for leaks.
    • Start the engine and let it idle for a minute, then check again for any leaks.

Cobra CX50FWE Model-Specific Notes

  • Oil type is critical: Only use Cobra Venom 3 Shoe Clutch Milk, as this formula is specifically designed for the automatic clutch and transmission of the Cobra CX50FWE. Using other oils can shorten clutch life and reduce performance

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  • Oil quantity guidance: While 300ml is standard, Cobra engineers confirm that up to 350ml is acceptable and may slightly improve clutch longevity. Never exceed 350ml

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  • Change frequency: For race or heavy duty use, change the oil every 2-3 rides or after any deep mud/water exposure

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  • Drain plug location: It is intentionally low and close to the brake lever for complete oil evacuation–ensure you remove only the correct plug on the clutch cover

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  • After first hour of break-in, always change oil: This removes early debris and clutch wear-in material

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Why Change the Oil So Frequently?

  • The CX50FWE's transmission and clutch share oil. Clutch particles, heat, and racing conditions rapidly degrade oil quality.
  • Frequent changes prolong clutch and gear life, keep shifting smooth, and prevent expensive repairs.
  • This interval is more demanding than on larger motorcycles, but essential for winning performance and durability.

Pro Tip from MotoSport.com

  • Mark a 300ml and 350ml line on your measuring cup with a permanent marker for fast, accurate fills every time.
  • Always check the condition of both the drain and fill plug gaskets–replace if damaged to prevent leaks.
  • Keep a log of oil changes to stay ahead of your maintenance schedule–your clutch will thank you.

For all your 2020 Cobra CX50FWE parts, lubricants, and racing needs, trust MotoSport.com—your destination for precision motocross performance.

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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.