How to Change the Coolant in a 2020 Cobra CX50FWE
Changing the coolant in your 2020 Cobra CX50FWE ensures peak performance and longevity for your high-output mini motocross engine. Follow these MotoSport-exclusive instructions for a safe, thorough coolant swap–and take note of details unique to your Cobra CX50FWE.
What Makes the 2020 Cobra CX50FWE Unique?
- Features a race-spec water pump–check for impeller integrity during service. Damaged impellers require a full back-flush to prevent debris in the cooling system.
- Uses a precision-sealed radiator–always inspect seals and watch for leaks after coolant service.
- Compact frame and radiator design–extra care needed when refilling and burping to avoid trapped air.
Step-by-Step Coolant Change Guide
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Preparation
- Park the CX50FWE on a firm surface and allow the engine to cool fully.
- Remove any necessary plastics for access to the radiator cap and draining point.
- Wear gloves and eye protection.
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Draining Old Coolant
- Remove the radiator cap.
- Find the drain bolt (usually at the lowest coolant point or water pump housing on the CX50FWE).
- Place a drain pan underneath.
- Remove the drain bolt or hose to let coolant flow out completely.
- Inspect old coolant for oil, contamination, or unusual discoloration. This can indicate engine problems requiring further inspection.
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Water Pump & Impeller Inspection
- On this model, impeller damage can clog coolant passages. If you find impeller debris, remove the ignition cover, inspect the impeller, and back-flush the system until clean water flows.
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Flushing the System (optional, but recommended)
- Reinsert the drain bolt temporarily.
- Fill the system with distilled water.
- Start the engine briefly, then shut off and drain again.
- Repeat until the water flows clear.
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Refill with Fresh Coolant
- Install a new sealing washer on the drain bolt and tighten it securely.
- Pour in high-quality, pre-mixed coolant (or mix with distilled water, never tap water).
- Fill to the base of the radiator filler neck.
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Burp the Cooling System
- Start the engine with the radiator cap off. Let idle for several minutes.
- Gently rev and rock the bike to help release trapped air bubbles.
- Watch for coolant movement; top off as needed.
- Replace the radiator cap before coolant overflows–do not overtighten.
- Let the bike reach full operating temperature, then shut down and cool completely.
- Recheck reservoir and radiator levels; top up to spec if needed.
Final Checks – Cobra CX50FWE Recommendations
- Check for visible leaks around pump, radiator, and hoses after first heat cycle.
- Remove any trapped air by cycling and topping off coolant until levels stabilize.
- Cobra recommends always using proper coolants formulated for high-performance mini dirt bikes.
- Dispose of old coolant responsibly–never dump down drains or onto the ground.
MotoSport wants your Cobra CX50FWE running cool, clean, and ready for the next moto–follow these steps and use only quality parts.
Related Shopping Categories
Shop Radiators for a 2020 Cobra CX50FWE Dirt Bike.
Shop Coolant for a 2020 Cobra CX50FWE Dirt Bike.
Shop Temperature Sensors for a 2020 Cobra CX50FWE Dirt Bike.
Shop Tools for a 2020 Cobra CX50FWE Dirt Bike.
Shop Radiator Hoses for a 2020 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.