How to Change the Coolant in a 2020 Cobra CX50P3
Shop parts for a 2020 Cobra CX50P3 Dirt Bike.
The 2020 Cobra CX50P3 is a competitive mini motocross bike engineered for reliable power delivery and rugged performance. One essential maintenance task to keep your machine running cool and performing its best is changing the engine coolant. Coolant protects internal engine parts from overheating and corrosion, crucial for the high-revving, air-cooled Cobra engine. Below is MotoSport.com's proprietary step-by-step guide to changing the coolant specifically for your 2020 CX50P3.
Tools and Supplies Needed
- Fresh OEM-recommended coolant (ready-mix or mix with distilled water as directed by the label)
- Drain pan
- Clean rags
- Phillips screwdriver or 8mm T-handle (as required for covers and drain bolt)
- Shop gloves
- Safety glasses
Steps to Change the Coolant
- Cool Down the Bike: Ensure the CX50P3 is cool to the touch before starting. Never open the radiator cap on a hot engine.
- Access the Radiator: Remove the front number plate or shrouds for easy access, if necessary.
- Open the Radiator Cap: Slowly turn the radiator cap counterclockwise until you hear a faint hiss, then remove it completely to relieve any residual pressure.
- Drain the Old Coolant: Place a drain pan under the water pump or lowest coolant hose. Locate the lower radiator hose or the specific drain bolt at the base of the radiator or engine (refer to your owner's manual if unsure). Loosen the hose clamp or bolt and allow all coolant to drain into the pan. Tilt the bike gently, if needed, to ensure complete drainage.
- Flush (Optional): For heavily used bikes or if you see sediment, flush the cooling system with distilled water by filling, running briefly, and draining fully. Repeat until running clear.
- Reinstall Drain Bolt/Hose: Inspect and clean the sealing washer on the drain bolt; replace if necessary. Reattach and securely tighten.
- Refill with Coolant: Carefully pour the fresh coolant into the radiator, slowly to prevent air bubbles. Fill up to the filler neck but do not overfill.
- Bleed Air from System: Gently rock the bike and tap radiator hoses to help trapped air escape. Look for air bubbles rising in the filler neck. On the CX50P3, a secondary return hose on the radiator helps. Repeat filling as needed until the fluid remains at the neck.
- Check & Top off Overflow: Some models have an external overflow or expansion tank; top it up to the upper level.
- Warm Up and Recheck: Refit the radiator cap securely. Start the engine and let it idle for several minutes, blipping the throttle a few times to circulate fluid and bleed remaining air. Shut off and allow to cool fully. Once cool, reopen the radiator cap and top up if the level has dropped. Repeat as needed until the coolant stays at the proper level.
- Final Inspection: Replace any body panels or covers. Check the system for leaks, especially around hoses and the drain bolt.
Special Notes for 2020 Cobra CX50P3 Owners
- Cobramoto specifies 450–500 ml coolant capacity for the CX50P3 radiator. Do not overfill.
- Always use Cobra's recommended coolant to prevent corrosion and gasket damage.
- Check coolant level after first ride; air bubbles may settle out over initial use, requiring a top-off.
- Dispose of all old coolant responsibly; it is hazardous to the environment and pets.
- If you operate in extreme conditions (hot weather, racing, frequent mud), check the cooling system more often for blockages or leaks.
Keep Your Cobra CX50P3 Cool
Regular coolant replacement is a simple but crucial step to ensure the longevity and peak performance of your Cobra CX50P3. Prioritize the right products, use careful technique, and enjoy maximum reliability on every ride.
Related Shopping Categories
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Shop Radiator Hoses for a 2020 Cobra CX50P3 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.