How to Change the Coolant in a 2025 GAS GAS EX 300: MotoSport Guide
Regular coolant changes are crucial for keeping your 2025 GAS GAS EX 300 running cool and protecting your engine from overheating and corrosion. This step-by-step guide is developed specifically for MotoSport riders, with tips unique to your bike.
Preparation
- Make sure your EX 300 is parked on a level surface and engine is cool to prevent injury.
- Gather the following:
- Fresh coolant compatible with modern two-stroke engines
- Socket wrenches
- Pliers (optional, for hose clamps)
- Drain pan
- Funnel
- Protective gloves and rags
Step 1: Remove the Radiator Cap
Locate the radiator cap—typically on the left side, just beneath the fuel tank. Unscrew it to relieve any pressure in the system. This also ensures a smooth drain by allowing air in as coolant flows out.
Step 2: Drain the Old Coolant
- Find the coolant drain bolt on the water pump cover, usually the lowest bolt on the right side of the engine.
- Position a drain pan below the bolt.
- Using the correct size socket, slowly remove the bolt and let the coolant drain fully.
- If flow is slow, check for blockage or slightly rock the bike side-to-side to help release trapped fluid.
Step 3: Flush the System (Optional but Recommended)
Pour distilled water into the radiator until it drains clear. This rinses out sediment and old coolant. Reinstall the drain bolt and torque it to manufacturer spec to prevent leaks.
Step 4: Add Fresh Coolant
- Using a funnel, pour new coolant into the radiator until full.
- Gently squeeze the lower radiator hose by hand to help remove air bubbles.
Step 5: Bleed the System
- With the radiator cap off, start the engine and let it idle for a couple of minutes.
- Watch for air bubbles escaping and add coolant as the level drops.
- Once no bubbles appear and the coolant remains steady at the filler neck, turn off the engine.
- Top off coolant if necessary and securely tighten the radiator cap.
Step 6: Check for Leaks and Inspect Coolant Level
- Start and warm the bike up, then let it cool and recheck level.
- Inspect around the drain bolt and hoses for any leaks.
Things to Note for the 2025 GAS GAS EX 300 Owner
- Frame Rigidity: For 2025, the EX 300's frame is notably stiffer, so always ensure your coolant service is done carefully to avoid damaging mounting points, especially during tank or shroud removal.
- Maintenance Intervals: The EX 300 shares much of its architecture with other Austrian-built two-strokes. Routine coolant changes every season or after 40 hours is advised for optimal reliability.
- Piston Life Advisory: The recommended piston service interval is every 15 hours of hard use. Monitoring your coolant for debris, metallic flakes, or odd color is a smart precaution since severe piston wear can compromise cooling efficiency.
- Airbox and Air Filter: The EX 300's airbox features easy, tool-free filter service. Take care not to spill coolant onto air intake components to prevent contamination.
- Clear Coolant Tank: The transparent polythene fuel tank on the EX 300 makes it easy to spot leaks or any coolant contamination.
Final Tip
Properly dispose of used coolant according to your local regulations, as it is highly toxic to both animals and the environment. Keep your EX 300 maintained with MotoSport for worry-free riding all year long!
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.