How to Change the Coolant in a 2019 GAS GAS EC 300
Keeping your 2019 GAS GAS EC 300's coolant fresh is crucial for engine longevity, optimal performance, and reliable off-road riding. This step-by-step guide walks you through the proprietary MotoSport method for a coolant change, along with tips specific to this popular 300cc 2-stroke dirt bike.
Essential Preparation
- Allow your engine to cool completely before starting. Coolant is under high pressure and can cause burns if opened when hot.
- Gather a catch pan, correct amount of recommended motorcycle coolant, funnel, and basic hand tools.
- Consult your user manual for torque specifications and radiator capacity. For the EC 300, these are especially important to prevent overtightening and leaks.
Step 1: Access the Radiator and Coolant Drain Bolt
- Remove the seat and left shroud to reach the radiator cap and main drain bolt easily. The radiator cap is located on top of the left radiator.
- Identify the coolant drain bolt, often found on the water pump cover at the lowest point of the cooling system.
Step 2: Drain Old Coolant
- Set a drain pan beneath the bike and carefully loosen the radiator cap to relieve any residual pressure.
- Remove the drain bolt and let the old coolant flow out completely. Tilting the bike towards the bolt side may help fully empty the system.
Step 3: Inspect the System
- Check old coolant for metal shavings, oil, or excessive contamination. Issues here can signal engine or gasket problems.
- Inspect the radiator hoses and drain bolt sealing washer. Replace any worn or cracked components during service.
Step 4: Reinstall and Torque the Drain Bolt
- Reinstall the drain bolt with a fresh sealing washer and torque it to spec (consult your EC 300 manual for the specific value; usually around 10 Nm for an M6 bolt).
Step 5: Refill with New Coolant
- Use a high-quality, motorcycle-specific coolant. GAS GAS recommends a 1:1 mix of coolant and distilled water for most climates. Check owner's guidance for cold weather operation.
- Fill the radiator slowly using a funnel until coolant reaches the top of the neck.
Step 6: Bleed Air from the System
- Your EC 300 includes a coolant bleeder screw typically located on top of the cylinder head. Loosen this screw after filling until coolant escapes without bubbles, then tighten to spec. This ensures no air is trapped, which could cause overheating.
Step 7: Reassemble and Final Checks
- Reinstall the radiator cap and shrouds, being careful not to overtighten plastic fasteners or strip threads.
- Start the engine and let it idle, briefly revving several times. Shut off and recheck coolant level after coolingtop off as needed.
Key EC 300-Specific Notes
- This model's cooling system is designed for aggressive enduro use. Pay extra attention to the radiator bleeder, as trapped air is a known issue in the 2-stroke EC series.
- Inspect the radiator guards and louver condition; mud build-up on this bike can quickly lead to overheating if not regularly cleaned.
- Stay mindful of maintenance intervals. Periodic coolant changes are advised for maximum reliability, especially if riding in harsh conditions or racing.
With these steps, your 2019 GAS GAS EC 300 is ready to stay cool, even through the most demanding rides. Regularly inspect and refresh coolant to protect your investment and ensure top performance on any trail.
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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.