How to Change the Coolant in a 2021 GAS GAS MC 50
Maintaining the cooling system on your 2021 GAS GAS MC 50 is crucial for performance and engine longevity, especially given the high-revving nature of this two-stroke mini motocrosser. Regular coolant changes help ensure optimal heat control and component life. Follow this MotoSport-exclusive step-by-step guide for a safe and clean process designed specifically for your MC 50.
What You Will Need
- Fresh, high-quality coolant (compatible with aluminum engine components)
- Drain pan
- 8mm wrench or socket (for radiator drain plug)
- Phillips screwdriver (for radiator shroud removal)
- Rags and gloves for safety
- Funnel
Key Things to Know about the 2021 GAS GAS MC 50
- The MC 50 uses an aluminum radiator and engine – always select coolant designed for mixed-metal cooling systems.
- Never attempt to open the radiator cap or drain coolant if the engine is hot. Hot engines can build high pressure within the cooling system, causing scalding injuries when opened. Always let the engine cool completely before servicing the coolant system.
- This model’s low capacity cooling system means any air trapped can lead to rapid overheating. Bleed carefully and check the level once completed.
- Always dispose of used coolant responsibly – never dump it on the ground or into drains.
Step-By-Step Coolant Change Instructions
- Allow the Bike to Cool
Park your MC 50 on level ground and ensure the engine is completely cold. - Remove Radiator Shrouds
Use a Phillips screwdriver to remove the bolts from the plastic radiator shrouds for easy access to the filler neck and radiator. - Position the Drain Pan
Place the drain pan under the right side of the bike, below the water pump housing or the lowest radiator hose connection – this is where the coolant will exit. - Open the Radiator Cap
Slowly twist the radiator cap off. If you feel resistance or hear bubbling, allow additional time for pressure release before proceeding. - Loosen the Drain Plug or Lower Hose
Using your 8mm wrench or socket, carefully loosen and remove the drain bolt at the water pump housing (if equipped), or disconnect the lowest radiator hose. Be prepared for coolant flow. - Drain the Coolant Completely
Let all old coolant drain out. Carefully tilt the bike side-to-side to ensure maximum drainage. - Inspect and Reinstall
Check sealing surfaces and O-rings for damage. Reinstall the drain bolt (torque to spec if available) or reattach the hose securely. - Refill Coolant
Using a funnel, slowly pour fresh coolant into the radiator neck until it reaches the top of the core. Gently rock the bike or squeeze the hoses to help purge trapped air. Continue filling as needed. - Bleed the System
With the cap off, tilt the bike left and right to release air pockets. When bubbles stop surfacing, top off if necessary. - Reinstall Radiator Cap and Shrouds
Reinstall the radiator cap securely. Reattach all shroud plastics with the Phillips screws. - Warm Up and Check for Leaks
Start the bike and let it idle for several minutes. Shut off and allow to cool, then recheck the coolant level and inspect for leaks. Top up again if needed.
MotoSport Technician Tips
- Never use regular automotive coolant or straight water – non-moto formulas can corrode aluminum and offer insufficient protection.
- If the bike overheats after a coolant change, re-check for trapped air or low coolant; repeat the bleeding process if necessary.
- Change coolant at least once per year, or more often if used in extreme climates or competitive racing.
Final Notes for MC 50 Owners
- This mini motocross bike is engineered for young racers, so proper maintenance of the cooling system has a direct impact on safety and performance. Never ignore signs of overheating, and double-check coolant levels before each ride.
- Routine inspection of hoses, radiator fins, and the water pump is recommended during any coolant service to ensure no leaks or damage have occurred.
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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.