How to Change the Coolant in a 2024 GAS GAS EX 250
Keeping the coolant fresh in your 2024 GAS GAS EX 250 is essential for optimal engine performance, especially on high-temp rides or race days. This guide from MotoSport.com will walk you through the process, giving you model-specific tips so your EX 250 stays performing at its best. Always allow the engine to cool completely before attempting to service the cooling system.
What Makes the 2024 GAS GAS EX 250 Unique?
The 2024 EX 250 features a lightweight aluminum radiator and a compact engine layout, requiring careful handling to avoid damaging fins or overtightening drain bolts. This model also includes a bleed screw on the cylinder head to assist with air evacuation from the system, which is critical for preventing hot spots and improper cooling.
Tools and Materials Needed
- Drain pan
- 8mm or 10mm socket (check your drain bolt size)
- Flathead screwdriver (for radiator cap and hose clamps)
- Funnel
- New coolant (compatible with aluminum radiators motocross ready coolant or premixed engine ice recommended)
- Gloves and protective eyewear
- Clean rags
Step-by-Step Coolant Change
- Preparation: Place the bike on a stable stand with the engine completely cool. Remove the radiator shrouds if needed for access.
- Remove Radiator Cap: Slowly unscrew the radiator cap to relieve pressure. Always do this when cold to prevent burns.
-
Drain Old Coolant:
- Locate the coolant drain bolt on the lower area of the water pump cover (right side of the engine case).
- Position the drain pan underneath, then remove the bolt and allow the coolant to fully drain.
- For a more thorough flush, lightly squeeze radiator hoses to help force out trapped fluid.
- Inspect and Clean: Inspect the removed drain bolt washer for wear, replacing if necessary. Clean the drainage area around the bolt hole and ensure no debris enters the system.
- Secure the Drain Bolt: Reinstall the drain bolt with proper torque (usually 6–9 Nm, but confirm with your owner's manual). Over-tightening can strip soft aluminum threads.
-
Refill with Coolant:
- Using a funnel, slowly add the new coolant through the radiator cap opening. Fill until the coolant is visible just below the cap seat.
- Loosen the air bleeder screw located on the top of the cylinder head (see your service manual for the exact screw on the EX 250). As air exits and coolant begins to seep (steady stream without bubbles), retighten the bleeder screw.
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Bleed the System:
- Gently rock the bike side to side to help dislodge any trapped air bubbles.
- Top off the radiator again if needed.
- Check and Reassemble: With the radiator cap off, start the engine and let it idle for 1–2 minutes, keeping an eye on the coolant level add if necessary.
- Reinstall radiator cap and shrouds.
- Final Inspection: After a short test ride, recheck the coolant level and inspect for any leaks at the drain bolt, hoses, and radiator. Top off the coolant if needed.
Important Model-Specific Notes for the 2024 GAS GAS EX 250
- This engine uses a pressure-rated radiator cap ensure you do not swap it with a non-OEM alternative, as correct pressure is vital for system efficiency on the 250 two-stroke.
- The EX 250 does not use a coolant overflow tank, so any fluid loss during use must be checked and replenished after each hard ride.
- Only use coolants compatible with magnesium or aluminum engine parts to avoid corrosion or premature gasket wear.
- Dispose of old coolant according to your local environmental regulations never pour it down a drain.
Service Intervals and Tips
- Inspect coolant every 15 hours or after muddy/wet rides.
- Replace coolant at least once per season or every 30–40 hours for optimal system health.
- Always check the tightness of hose clamps after any cooling system service to prevent leaks.
MotoSport.com makes maintaining your 2024 GAS GAS EX 250 easy – from genuine parts to proactive upgrades, shop parts for your ride now!
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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.