How to Change the Coolant in a 2025 GAS GAS MC 50
Proper coolant maintenance is essential to keep your 2025 GAS GAS MC 50 running cool, maximizing power output, and protecting your engine from premature wear. Thanks to a redesigned cooling system with a single oversized radiator and simplified hose routing, service on the latest MC 50 models is easier than ever. This guide walks you through the process so you can ride with confidence.
Tools &ndash Parts &ndash Safety Gear
- Fresh coolant (use a high-quality motorcycle-specific coolant compatible with aluminum engines)
- Basic metric hand tools
- Small drain pan
- Shop rags
- Gloves & eye protection
Preparation
- Let the engine cool completely before working on the cooling system.
- Work on a stable, level surface.
- If possible, wash the bike to prevent contamination from dirt or debris.
Coolant Drain Procedure
- Locate the coolant drain bolt on the water pump cover, typically on the lower right side of the engine case.
- Place the drain pan below the drain bolt to catch old coolant.
- Remove the radiator cap slowly to release system pressure.
- Loosen and remove the drain bolt completely. Allow coolant to drain fully.
- Inspect the old coolant for signs of oil, rust, or debris, which could indicate a problem in the system.
Flushing (Recommended Process)
- For best results, once drained, add a small amount of distilled water into the radiator, re-install the drain bolt, and run the engine for a brief period (30&ndash60 seconds) before repeating the drain process. This helps flush any residual old coolant.
Refilling with Coolant
- Reinstall the drain bolt. Torque to factory spec (hand tight, then an additional small turn; avoid overtightening).
- SLOWLY pour new coolant into the radiator up to the filler neck.
- Allow air bubbles to escape &ndash you may need to gently tap radiator hoses or slightly tilt the bike to help trapped air rise.
- Some MC 50 models may have a small bleed screw or port at the top of the cylinder head. Crack this open while filling to ensure all air is expelled, then tighten once coolant flows steadily out.
- Reinstall the radiator cap securely.
Final Steps
- Start the engine and let it idle until warm. Watch the coolant level in the radiator &ndash you may need to top off once the thermostat opens.
- After cooling down, recheck the coolant level and top off if needed.
- Inspect for leaks at all drain and bleed points.
Key Tips for 2025 GAS GAS MC 50 Owners
- The 2025 MC 50 features a new single-radiator design for simplified maintenance and improved cooling performance, which helps with more consistent engine temps and reduces the risk of overheating during intense riding sessions.
- Pay attention to the redesigned hose layout&mdashthis makes coolant changes easier, but always double-check clamp tightness after refilling.
- Be sure to use only recommended, high-quality, premixed coolants suitable for aluminum engine parts to prevent internal corrosion.
- The new cylinder head design may have a different bleed location compared to older models, so familiarize yourself with your specific bike before starting the job.
- Never mix different coolant types&mdashalways flush thoroughly before switching brands or formulations.
- If you experience repeated overheating or need to top off often, inspect all hoses, radiator, and water pump for leaks or blockages.
Coolant changes are a great time to inspect your MC 50 for any other routine service needs and spot early signs of wear. Keeping your cooling system in peak condition is one of the best ways to support engine life, power delivery, and consistent performance. For all your maintenance needs and upgrades, MotoSport is the ultimate destination for genuine and aftermarket GAS GAS MC 50 parts.
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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.