How to Change the Coolant in a 2012 Cobra CX50 Big Wheel
Shop parts for a 2012 Cobra CX50 Big Wheel Dirt Bike.
The 2012 Cobra CX50 Big Wheel is a competition-ready, liquid-cooled 2-stroke mini motocross bike. Proper maintenance—especially the cooling system—is essential for reliable performance, durability, and rider safety.
Before You Start:
- Always allow the engine to cool completely before servicing the cooling system to prevent burns.
- Use a 50/50 mix of antifreeze-coolant and distilled water in the CX50's system for ideal performance and corrosion resistance.
- Inspect hoses, radiator shrouds, and all external fittings for damage or leaks. The 2012 model features improved radiator shrouds for enhanced protection and air flow; ensure these are clean and debris-free for best cooling.
Tools and Supplies Needed:
- Flat screwdriver
- Drain pan
- New coolant (50/50 premixed or mix yourself with distilled water)
- Clean rags
- Protective gloves
Step-by-Step Coolant Change Procedure:
- Remove the radiator shroud: Use a screwdriver to carefully unscrew and remove the plastic shroud covering the radiator. This allows easy access and ensures you don–t spill on engine electronics.
- Locate the drain bolt: Find the coolant drain bolt, typically found at the base of the water pump, lowest point in the system.
- Drain the old coolant: Place your drain pan securely under the drain bolt. Unscrew the bolt slowly and let the coolant flow out entirely. Open the radiator cap (top of the radiator) to speed up draining.
- Flush (if needed): For a full service, flush the system with distilled water to remove scale, corrosion, or debris. Pour distilled water into the radiator, replace the cap, run the engine briefly, then repeat the drainage process.
- Replace the drain bolt: Once empty, reinstall the drain bolt, tightening it snugly but not overtight.
- Add new coolant: Pour the 50/50 antifreeze-coolant / distilled water mix into the radiator slowly, pausing to let air escape and prevent bubbles.
- Bleed the system: Bounce the bike gently or squeeze radiator hoses with the cap off to help trapped air escape. Top up as necessary.
- Replace the radiator cap and shroud: Secure the radiator cap, reattach the shroud, and wipe down any spilled fluid with clean rags.
- Run and recheck: Start the engine, bring it up to operating temperature, then shut down and check the coolant level again. Add if needed.
Model-Specific Notes for the 2012 Cobra CX50 Big Wheel:
- The CX50 Big Wheel uses unique 14 inch rims up front for superior stabilityensure the added wheel size does not obscure radiator access during maintenance.
- The cooling system is engineered for high output racing; any sign of overheating or rapid coolant loss should be investigated immediately.
- Always use the manufacturer's recommended coolant blend to avoid performance issuesnever substitute random coolants or tap water, as this may damage internal seals or corrode the water pump.
- Routine inspection of shroud fittings and radiator for cracks is advised due to the high vibration and aggressive terrain typical of this bike.
Keep your Cobra CX50 Big Wheel in top condition with regular coolant changes—it's a simple step that pays off with reliable laps and peace of mind at the track. For high-quality replacement parts and more model-specific upgrades, shop parts for a 2012 Cobra CX50 Big Wheel Dirt Bike..
Related Shopping Categories
Shop Radiators for a 2012 Cobra CX50 Big Wheel Dirt Bike.
Shop Coolant for a 2012 Cobra CX50 Big Wheel Dirt Bike.
Shop Temperature Sensors for a 2012 Cobra CX50 Big Wheel Dirt Bike.
Shop Tools for a 2012 Cobra CX50 Big Wheel Dirt Bike.
Shop Radiator Hoses for a 2012 Cobra CX50 Big Wheel 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.