How to Change the Coolant in a 2025 GAS GAS MC 350F: A MotoSport Guide
Regular coolant changes are critical to keeping your 2025 GAS GAS MC 350F running cool and protected–especially if you ride in harsh or muddy conditions. The MC 350F uses a modern aluminum radiator system with a top-mounted bleeder that makes flushing straightforward, but there are a few model-specific tips owners need to know to prevent overheating and ensure maximum reliability. This MotoSport guide gives you everything you need to get it done right.
Tools & Supplies
- Drain pan
- 8mm & 10mm socket or wrench
- Screwdriver (for shrouds/plastics)
- Replacement coolant (GAS GAS recommends a quality motocross/ATV coolant, silicate-free and rated for aluminum engines)
- Funnel (small-necked for easy filling)
- Shop towels or rags
- Torque wrench (recommended for precision)
Step-by-Step Coolant Change Instructions
- Allow the engine to cool completely before starting. Changing coolant on a hot engine can cause burns and pressure spray.
- Remove the radiator shrouds (if necessary) using a screwdriver or 8mm socket to provide full access to the radiator cap and drain bolt.
- Remove the radiator cap. This releases any pressure and ensures a complete drain.
- Locate the coolant drain bolt. On the 2025 MC 350F, the drain bolt is usually found at the lowest point of the water pump housing on the right side of the engine case.
Place your drain pan beneath it. - Remove the drain bolt and let the old coolant fully drain. Inspect the coolant for contamination or excessive debris–if there is oil in the coolant, stop and address underlying mechanical issues before refilling.
- Reinstall the drain bolt. Clean and inspect the sealing washer, replacing it if necessary. Tighten the bolt to factory torque spec (refer to the owner’s manual for precise torque value for 2025 models).
- Fill fresh coolant through the radiator cap neck. On the MC 350F, fill slowly to about 1cm below the filler neck while the bike is upright. Use a funnel to avoid spills.
- Bleed the air from the system.
- Locate the small bleeder screw on top of the cylinder head. Loosen it with the bike upright after partial filling until coolant seeps out without air bubbles, then retighten securely.
- Top off the coolant to the correct level if necessary.
- Reinstall the radiator cap. Make sure it is seated tightly and correctly.
- Start the engine and inspect for leaks. Let the engine idle for a few minutes, then let it cool down. Recheck the coolant level and top off as needed to ensure the system is full and bled of air.
- Reinstall plastics/shrouds. Clean up any spilled coolant, dispose of old coolant responsibly, and you are ready to ride.
2025 GAS GAS MC 350F Coolant System Tips & Notes
- This model uses a compact, high-efficiency radiator system plus a convenient bleeder port at the cylinder head–proper bleeding is essential for preventing air pockets and avoiding overheating.
- Never mix coolant types; use only silicate-free, aluminum-compatible formulas to prevent radiator corrosion and water-pump seal wear.
- Ideal coolant capacity: Always confirm with your service manual or by measuring removal/fill amounts (typical capacity is around 1 liter for most 350F models).
- Routinely inspect radiator hoses for cracking or bulging and radiator fins for mud or damage. Replace worn hoses promptly.
- If you ride in mud or sand, flush the radiator externally after muddy rides to preserve cooling performance.
Why Timely Coolant Changes Matter
Fresh coolant not only manages engine temperature but protects internal passages from corrosion and scale buildup. On the high-revving MC 350F, keeping the coolant fresh is insurance against expensive repairs and keeps your powerplant performing at its peak.
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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.