How to Change the Coolant in a 2023 GAS GAS MC 125
Regular coolant changes are essential for keeping your GAS GAS MC 125 running cool and performing at its best. This model has a high-performance 2-stroke engine and a pressurized cooling system, so follow each step carefully to protect both your engine and yourself from harm. Here's a step-by-step guide made specifically for 2023 MC 125 owners.
What You Need
- Fresh, compatible motorcycle coolant
- Drain pan
- Rags and gloves
- 8mm socket or T-handle
- Funnel
Important Notes for the 2023 MC 125
- The cooling system is under pressure when hot. Always let the engine and system fully cool before opening the radiator cap or hoses. This avoids burns and coolant spray–serious injuries can occur if these warnings are ignored.
- If coolant gets on your skin or in your eyes, rinse immediately with plenty of water and change contaminated clothing.
- The system's radiator cap is rated to 1.8 bar (26 psi)–if the cap is damaged or leaking, only replace with a matching pressure rating for safe operation.
Step 1: Preparation
- Make sure your bike is completely cool.
- Stand the motorcycle upright on a stable, level surface.
- Remove the seat and right side panel for easy access to the radiator cap and hoses.
Step 2: Draining the Old Coolant
- Place a drain pan beneath the engine, directly under the coolant drain bolt on the water pump cover (right side of the engine).
- Slowly loosen and remove the radiator cap. If you feel pressure or hear a hiss, retighten and wait longer for the system to cool.
- Use your 8mm tool to remove the coolant drain bolt.
- Allow all coolant to drain into the pan. Remove the bike's left radiator lower hose (if easier access is needed) to speed up draining the system completely.
- Inspect the drained coolant for dirt, oil, or debris–if present, consider flushing the cooling system with clean water before refilling.
Step 3: Reassembly – Ready for New Coolant
- Reinstall the coolant drain bolt. Tighten it to manufacturer specs to avoid leaks–do not over-tighten.
- Install the radiator hose if you removed it.
Step 4: Adding Fresh Coolant
- Slowly pour new coolant into the radiator neck using a funnel to prevent spills. Stop when the coolant reaches the bottom of the filler neck.
- To bleed air from the system, gently rock the bike side-to-side and briefly loosen the radiator bleed screw (often atop the cylinder head) until you see coolant trickle out without bubbles. Tighten the bleed screw securely.
- Top off the radiator as needed after bleeding.
Step 5: Final Checks
- Install the radiator cap securely.
- Reinstall your side panel and seat.
- Start the engine and let it idle with the bike upright. Watch the coolant level through the radiator cap opening.
- Once the engine reaches warm operating temperature, turn it off and let it cool. Re-check the coolant level and top off if needed.
- Inspect the drain bolt, radiator hoses, and cap for leaks after riding the first time.
Model-Specific Tips & Maintenance
- Routinely check your radiator cap and hose condition. The MC 125's high-strung 2-stroke can overheat quickly if airflow is blocked or coolant is low.
- Keep the radiator fins clean and straight for maximum cooling. Bent fins can limit airflow and cause overheating.
- Adjust the carburetor settings for weather and elevation as a hot-running engine can affect performance and coolant longevity.
By following these steps and safety tips, your 2023 GAS GAS MC 125 will be ready for tough motos and long rides. Always use OEM-quality coolant and inspect your system for signs of wear each service. Ride confident, knowing your machine is maintained the MotoSport way.
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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.