How to Change the Coolant in a 2016 Cobra CX50FWE

Shop parts for a 2016 Cobra CX50FWE Dirt Bike.

Changing the coolant in your 2016 Cobra CX50FWE is essential for maintaining engine efficiency and preventing overheating during intense riding conditions. This guide is proprietary to MotoSport–follow the steps closely to ensure optimal cooling performance and protect your investment.

What Makes the Cobra CX50FWE Cooling System Unique?

  • High-Performance Design: The CX50FWE uses a compact liquid cooling system optimized for race-level power delivery. Keeping the system clean and properly filled supports the bike's automatic clutch and aggressive engine tuning.
  • Capacity: The system holds approximately 450–500 milliliters of coolant—do not overfill beyond manufacturer specifications for best results.
  • Special Parts: Key cooling components are designed for easy service, but always use OEM-quality coolants and replacement gaskets. Aftermarket or non-recommended fluids may reduce clutch and overall engine life.

Step-by-Step Coolant Change Procedure

  1. Preparation: Make sure the engine is cool to avoid burns. Place the bike on a stable, level surface.
  2. Access the Radiator: Remove the radiator cap, which is usually centrally located on the top of the radiator shroud. Gently twist and lift–never force the cap when the engine is hot to prevent pressure bursts.
  3. Drain the Old Coolant:
    • Locate the coolant drain bolt–typically an 8mm bolt on the lower radiator hose or water pump housing.
    • Position a drain pan underneath and remove the drain bolt. Allow all old coolant to flow out, then reinstall the bolt with its gasket when drainage stops.
  4. Flush (Optional for Thorough Service): If desired, flush the system with distilled water to remove any residue. Replace the drain bolt after each flush.
  5. Refill with New Coolant:
    • Fill the radiator with high-quality dirt bike coolant. Follow Cobra's recommendation and use approved formulations to maintain system integrity.
    • Pour slowly until the radiator appears full (around 450–500 ml), allowing air bubbles to escape.
  6. Burp the System:
    • With the cap off, slightly squeeze the return hose or gently tilt the bike side to side.
    • Watch for bubbles rising–repeat this until only liquid is visible. This step removes trapped air and ensures maximum cooling performance.
  7. Replace Cap – Inspect for Leaks: Reinstall the radiator cap tightly and check connections for drips. Straighten all hoses carefully and inspect for abrasion or wear.

Additional Tips for CX50FWE Owners

  • Monitor Coolant Level Regularly: Check before each ride. Low coolant often indicates leaks, which should be serviced immediately to prevent engine damage.
  • Choose the Right Coolant: Only use recommended blends. Avoid automotive coolants, which might degrade the specialized clutch and transmission lubrication properties of Cobra's engine.
  • Inspect Radiator & Hoses: Look for cracks, worn grommets, or signs of impact damage, especially after racing or crashes. Replace parts with MotoSport OEM-fit components for reliability.
  • Burping Is Critical: Air pockets reduce cooling efficiency—always follow burping steps after each change to avoid overheating.
  • Maintaining Clutch & Transmission: After changing coolant, consider checking the transmission fluid as well; Cobra recommends their proprietary clutch fluid for best results.

When to Service

  • Change coolant every 20–30 racing hours or annually, whichever comes first.
  • Immediately after running the bike in muddy or high-temperature conditions.

Keeping your CX50FWE's cooling system properly serviced lets riders compete at the highest level while maximizing engine life. For all replacement parts and service kits, MotoSport is your source for Cobra-specific components.

Related Shopping Categories

Shop Radiators for a 2016 Cobra CX50FWE Dirt Bike.

Shop Coolant for a 2016 Cobra CX50FWE Dirt Bike.

Shop Temperature Sensors for a 2016 Cobra CX50FWE Dirt Bike.

Shop Tools for a 2016 Cobra CX50FWE Dirt Bike.

Shop Radiator Hoses for a 2016 Cobra CX50FWE 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.