How to Change the Coolant in a 2020 GAS GAS EC 300: MotoSport Guide
Routine coolant changes keep your 2020 GAS GAS EC 300 running cool – and can prevent costly overheating damage. This guide gives you proprietary, step-by-step instructions for a complete coolant flush, with tips specific to your EC 300 2-stroke.
What You’ll Need
- Fresh premixed motorcycle coolant (silicate-free and compatible with aluminum, 50/50 mix recommended)
- Basic hand tools (sockets, screwdrivers, pliers)
- Drain pan
- Shop rags
- Funnel
- (Optional) Torque wrench
- Rubber gloves & eye protection
Things to Know About Your EC 300
- The 2020 EC 300 features a compact, closed aluminum radiator system. Always use silicate-free, OAT-based coolant to prevent internal corrosion and clogging.
- Make sure the engine is completely cool before starting. Never open the radiator cap when the system is hot—serious injury may result from escaping steam and hot coolant.
- Routine coolant replacement is recommended yearly, or more often if you ride hard or in muddy conditions. Check the level before every ride.
Step-By-Step Coolant Change
-
Remove Protective Panels:
Gently take off the left radiator shroud for easier radiator cap access. -
Position Bike & Drain Pan:
Stand the bike upright (using a stand if needed). Slide the drain pan below the water pump area on the right side of the engine. -
Loosen Drain Bolt:
Locate the coolant drain bolt at the base of the water pump. Wearing gloves, loosen and remove the bolt (8mm or 10mm socket depending on model specifics). -
Remove Radiator Cap:
Open the radiator cap. This allows air in and helps coolant to drain more quickly. -
Let Coolant Drain:
Allow all coolant to fully drain from both radiators and the engine until the flow stops. -
Inspect and Clean:
Check the drained fluid for any oily residue (possible head gasket issue). Clean any spilled coolant thoroughly. -
Reinstall Drain Bolt:
Clean the bolt and sealing washer. Reinstall. Hand tighten, then torque to spec (typically 7–10 Nm). -
Refill Coolant:
Slowly pour premixed coolant into the radiator. Fill until coolant is visible at the base of the filler neck. -
Bleed Air from System:
The EC 300 features a bleeder port on top of the cylinder head: gently loosen the small screw or fitting. Add coolant until a steady stream (no bubbles) exits, then tighten the bleeder. Top off coolant as needed. -
Reinstall Radiator Cap and Shroud:
Ensure the system is still cool. Refit the radiator cap and tighten the shroud. -
Check for Leaks & Final Level:
Start the bike and let it idle until warm. Shut off and let cool. Double-check coolant level and inspect for any leaks.
Pro Tips for GAS GAS EC 300 Owners
- After a coolant change, always check the level again after your first ride – trapped air may settle, requiring a small top-off.
- Only use coolants compatible with magnesium and aluminum—traditional automotive fluids can damage your EC 300’s cooling system.
- If you routinely ride in extreme heat or mud, consider changing coolant more frequently for optimal protection.
- Schedule yearly cooling system flushes to remove debris and possible contaminants before they cause issues.
Coolant change intervals and capacities can vary slightly based on riding style and conditions. If you ride your GAS GAS EC 300 hard, or in "stop and go" or muddy races, keep a close eye on coolant condition and radiator cleanliness.
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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.