How to Change the Coolant in a 2018 Cobra CX50FWE: MotoSport Guide
Shop parts for a 2018 Cobra CX50FWE Dirt Bike.
The Cobra CX50FWE is engineered for dedicated young riders demanding performance and reliability. Regular maintenance, including coolant changes, ensures the liquid-cooled 2-stroke engine stays healthypreventing overheating and maximizing performance on race day. Follow this model-specific, MotoSport-exclusive guide to change the coolant properly on your 2018 Cobra CX50FWE and keep your mini moto running at peak capacity.
Why Coolant Maintenance is Vital for the Cobra CX50FWE
- Professional-grade performance: The CX50FWE's high-revving engine generates significant heat. Fresh, high-quality coolant preserves proper engine temperature and prevents wear or potential engine seizure.
- Unique design: The radiator and water pump are compact and efficient but require periodic coolant changes for sustained performance.
Tools & Supplies Needed
- Fresh coolant compatible with 2-stroke bikes (preferably ethylene glycol-based, silicate-free, premixed with distilled water)
- Drain pan or container (minimum 1 liter capacity)
- Phillips screwdriver
- 8mm or 10mm wrench (verify with your owner’s manual for specific bolt sizes)
- Safety gloves and eye protection
- Clean rags or towels
Step-by-Step Coolant Change Process
- Allow the Bike to Cool
Ensure the CX50FWE is completely cool before beginning. Hot coolant can cause severe burns. - Access the Radiator Cap
Remove the front number plate or shroud as needed to access the radiator cap. Loosen the cap slowly to release any built-up pressure. - Locate & Remove the Drain Bolt
Find the coolant drain bolt (typically at the water pump cover on the lower right side of the engine). Place the drain pan below it. Loosen and remove the drain bolt, allowing all old coolant to drain completely.
Tip: To facilitate drainage, gently rock the bike side to side after removing the bolt. Remove the radiator cap fully while draining. - Flush the System (Optional but Recommended)
If you notice contaminants or discoloration, fill the system with distilled water, reinstall the drain bolt, and briefly run the engine (30-60 seconds). Let it cool, then drain again. - Inspect Components
While draining, check the radiator hoses for cracks, swelling, or brittleness and inspect hose clamps for tightness. Replace as necessary to avoid future leaks. - Reinstall Drain Bolt
Once empty, reinstall the drain bolt using the correct torque as specified in your Cobra manual. Ensure the sealing washer or gasket is intact. - Fill with New Coolant
Add fresh coolant through the radiator neck until it reaches the very top. Fill slowly to reduce air bubbles. - Bleed the Cooling System
Start the engine and let it idle with the radiator cap off (if safe). Briefly rev the engine and gently rock the bike to help trapped air escape. Watch for air bubbles rising to the neck. Add more coolant if the level drops.
When no more bubbles appear, and the level stays constant, shut off the engine and reinstall the radiator cap securely. - Double-Check the System
After running the bike for a few minutes to reach operating temperature, let it cool and recheck the coolant level. Top off if necessary.
Also inspect for leaks, and ensure hoses and clamps are tight.
Cobra CX50FWE Owner Notes
- This model's compact radiator system requires careful bleeding to prevent air pockets that could cause overheating or engine damage. Always bleed thoroughly after a coolant change.
- Cobra recommends regular checks of the coolant level before every ride.
- Avoid mixing coolant brands or types. Use a high-quality product meant for 2-stroke, high-performance dirt bikes.
- If you ride in muddy or sandy conditions, periodically inspect the radiator fins for clogs and rinse with gentle water streams as needed.
When to Change Coolant on the 2018 Cobra CX50FWE
- Every 12 months or sooner if the coolant appears dirty, cloudy, or contaminated.
- Anytime you have serviced the water pump, hoses, or experienced overheating.
Pro Tips from MotoSport
- Dispose of used coolant responsiblynever dump it on the ground or in drains. Take it to an approved recycling center.
- Keep the cooling system clean; avoid tap water as it causes mineral buildup in the radiator.
- If overheating issues persist after a coolant change, inspect the water pump, radiator, and system for blockages or mechanical problems.
Related Shopping Categories
Shop Radiators for a 2018 Cobra CX50FWE Dirt Bike.
Shop Coolant for a 2018 Cobra CX50FWE Dirt Bike.
Shop Temperature Sensors for a 2018 Cobra CX50FWE Dirt Bike.
Shop Tools for a 2018 Cobra CX50FWE Dirt Bike.
Shop Radiator Hoses for a 2018 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.