How to Change the Coolant in a 2006 GAS GAS EC125
Regular coolant changes help your GAS GAS EC125 run cool and at peak performance. The 2006 EC125 features a two-stroke single-cylinder engine that depends on a clean, well-maintained cooling system to perform in harsh off-road conditions. While the process is similar to other dirt bikes, certain aspects unique to GAS GAS models – like bleed ports and component placements – are important to note. Follow this step-by-step MotoSport guide to keep your EC125 engine protected on every ride.
Items Needed
- Fresh, recommended motorcycle coolant (do not use tap water – only distilled)
- Basic hand tools (socket set, screwdrivers)
- Drain pan
- Gloves & safety glasses
- Funnel
- Rags or shop towels
Step 1: Preparation
- Ensure the engine is cool to avoid burns; never work on a hot system.
- Stand the bike upright and, if possible, on a work stand for easy access to both radiators.
- Remove the radiator cap slowly to release any residual pressure.
Step 2: Draining Old Coolant
- Locate the coolant drain bolt. On the 2006 EC125, this is typically on the water pump cover at the lower right side of the engine case.
- Place your drain pan directly beneath the bolt.
- Remove the drain bolt and allow all coolant to fully drain. Loosen the radiator cap the rest of the way if you haven‘t already – this helps speed draining.
- Inspect the bolt‘s sealing washer for damage and replace if necessary.
Step 3: Flushing (Optional, but recommended)
- If the coolant is especially dirty or you suspect contamination, use distilled water to rinse the system.
- Replace the drain bolt securely, fill with distilled water, run the bike for a few minutes, let cool, then drain again. Repeat until the water runs clear.
Step 4: Refilling the System
- Install the drain bolt with a new or undamaged washer. Do not overtighten.
- Slowly fill the radiator with the recommended motorcycle coolant. Use a funnel for accuracy and to avoid spills.
- On the EC125, use the bleed port or screw (typically found on top of the cylinder head) to release trapped air. Loosen this screw as you fill coolant until air bubbles stop and pure coolant emerges, then tighten gently.
Step 5: Bleeding Air from the System
- Top up coolant to the base of the radiator neck.
- Leave the radiator cap off, start the engine, and let it idle for several minutes. Occasionally blip the throttle gently.
- This circulates coolant and helps release any trapped air (commonly called "burping" the system).
- Keep an eye on the coolant level and add more if needed as air escapes and level drops.
- Once the level stabilizes and no more bubbles appear, reinstall the radiator cap securely.
Step 6: Final Checks
- Inspect the radiator and hose connections for leaks.
- Dispose of used coolant responsibly – it is toxic and environmentally harmful.
- After a short ride, check the coolant level again. If needed, top off once the engine cools.
EC125 Specific Notes & Tips
- The 2006 GAS GAS EC125 radiator cap is positioned high for accessible filling and burping.
- This model is vulnerable to trapped air if not bled through the cylinder head bleed screw. Always use this bleed port when servicing to prevent overheating.
- Do not use automotive coolant with silicates – always select motorcycle-specific coolant compatible with aluminum radiator components.
- Inspect radiator shrouds and hoses during coolant service for abrasion or damage from off-road use.
- Consult your owner‘s manual for coolant capacity. Most EC125 systems take approximately 0.7–0.8 liters, but always verify as this may vary with aftermarket modifications.
Keeping your 2006 GAS GAS EC125‘s cooling system fresh will protect your engine and deliver consistent performance throughout the riding season.
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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.