How to Change the Coolant in a 2025 GAS GAS EC 300 GP
The 2025 GAS GAS EC 300 GP is a competition-ready, liquid-cooled enduro bike, making coolant condition and level essential for performance and reliability. This guide provides a step-by-step process for changing the coolant, and points out details unique to your model so you can keep your machine running at its best.
What You Need
- New coolant compatible with modern liquid-cooled two-strokes
- Drain pan
- 8mm and 10mm socket or wrench
- Flathead screwdriver
- Clean funnel
- Shop rags
- Gloves and eye protection
Special Notes for the 2025 GAS GAS EC 300 GP
- Liquid cooling system features advanced temperature sensors that provide input to the Vitesco Technologies engine management system, optimizing ignition timing and fuel injection based on coolant temperature for top-end performance and reliability.
- Ensure the electric starter system is off and battery disconnected as a precaution whenever working around fluids near electrical connectors.
- Never run the engine when the cooling system is drained to avoid damaging temperature sensors or the cylinder.
Step-By-Step Coolant Change Guide
- Let the engine cool fully before working. Coolant in a hot engine can spray and cause burns.
- Remove the seat and side panels as needed to access the radiator and frame junctions. Place the bike on a level surface or work stand.
- Remove the radiator cap. Use a shop rag to shield your hand in case of residual pressure. Twist counterclockwise and set the cap aside.
- Locate the coolant drain bolton the EC 300 GP, this is typically a small bolt at the lowest point of the water pump cover, found on the right-hand crankcase near the hose junction.
- Place a drain pan under the engine. Remove the drain bolt using an 8mm wrench. Allow coolant to drain completely. Slightly lean the bike side-to-side to evacuate trapped fluid.
- Inspect the old coolant. Cloudy or contaminated coolant could indicate internal issues. Coolant should generally appear clear, tinted blue, green, or red (matching what you previously added.)
- Reinstall the drain bolt and torque to manufacturer spec. Avoid overtightening, which can strip threads on the aluminum case.
- Pour fresh coolant into the radiator using a clean funnel. Fill until coolant is visible just below the neck of the filler opening.
- Bleed air from the system by rocking the bike gently and squeezing radiator hoses by hand. Add coolant as the level dropsyour EC 300 GP will operate best with zero air pockets in the system.
- Reinstall the radiator cap securely.
- Start the engine and allow it to idle for several minutes. Observe the temperature indicator and coolant level. Add more coolant if the level drops as trapped air clears.
- Check for leaks at the drain bolt and around hoses. Tighten clamps if necessary.
- Reinstall the seat and side panels.
Maintenance Tips & Model-Specific Advice
- 2025 EC 300 GP uses sensor-driven cooling management–ensure temperature and coolant sensors remain clean and connected after any maintenance.
- Always use a pre-mixed, silicate-free, motorcycle-specific coolant. Do not mix types (ethylene glycol vs. propylene glycol) or blend different colors unless verified as compatible.
- Check fluid level frequently during riding season. Enduro racing, slow-speed technical riding, or extended idling can accelerate coolant loss.
- Consider upgrading to aftermarket radiator guards or a catch tank if you ride in rocky or technical terrain.
Your 2025 GAS GAS EC 300 GP is built to deliver high output and world-class enduro performance, so regular cooling system maintenance is critical. Enjoy the ride and keep your machine protectedroutine coolant changes will help ensure reliability and efficiency on every outing.
Related Shopping Categories
Shop Radiator Hoses for Your Ride
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.