How to Change the Coolant in a 2018 GAS GAS XC300: A Step-by-Step Guide
The 2018 GAS GAS XC300 stands as a popular enduro dirt bike, designed for both rugged trails and competitive off-road riding. Proper cooling is crucial to keep your two-stroke engine running strong and reliable. Changing the coolant is a straightforward maintenance task, but following model-specific guidelines is important for long-term engine health. This guide will walk you through a safe, mess-free coolant change – tailored for the unique needs of the 2018 GAS GAS XC300.
What Makes the 2018 GAS GAS XC300 Unique?
- The XC300 features a high-output two-stroke engine with a lightweight aluminum radiator system for improved cooling, essential for demanding enduro rides.
- The bike's radiator cap and drain bolt are positioned for easy access, but always ensure the bike is completely cool before starting.
- This model uses a non-pressurized overflow tank, a feature you should inspect for leaks or sediment during the coolant change process.
What You'll Need
- Fresh coolant (choose a premium motorcycle-specific coolant; avoid green automotive blends)
- Socket set – primarily an 8mm or 10mm socket for the drain bolt
- Phillips screwdriver
- Drain pan
- Funnel
- Gloves and rags for safety and cleanup
Step 1: Prep Your Bike
Ensure the engine is completely cool before starting. Place your bike upright on a stand or level surface. Remove both radiator shrouds using your Phillips screwdriver to fully access the radiator caps and hoses.
Step 2: Drain the Old Coolant
Locate the coolant drain bolt at the bottom left side of the engine (usually on the water pump). Position your drain pan beneath it. Slowly loosen the drain bolt with an 8mm or 10mm socket. Once the bolt is out, open the radiator cap (right side of the bars) to allow coolant to flow freely. Be careful of splashback – always wear gloves.
Check for signs of corrosion, sludge, or debris in the drained coolant. These could indicate internal component wear or a need for flushing the system.
Step 3: Flush & Inspect the System
To remove any degenerated coolant, pour a small amount of distilled water into the radiator, then temporarily reinstall the drain bolt. Start the bike for 20-30 seconds – just enough to circulate the water (do not let it reach temperature). Drain again and repeat until clear water comes out.
Examine hoses and the radiator cap for cracks or hardening. Replace as needed before refilling.
Step 4: Add New Coolant
With the drain bolt torqued back into place (do not overtighten), use a funnel to slowly add fresh coolant to the radiator until you reach the fill neck. Tilt the bike side to side to release air bubbles. Top off as necessary. Make sure the overflow reservoir is filled to the indicated mark (see your manual for its precise position beneath the shrouds).
Step 5: Bleed the Cooling System
Start the engine and let it idle with the radiator cap off (careful of splashing). Watch for bubbles—when they stop, the system is bled. Top off if needed, replace the cap securely, and reinstall your radiator shrouds.
Step 6: Final Checks
- Inspect under the bike and around every hose for any leaks, especially near the water pump and radiator tanks.
- After the first ride, check coolant levels again and top off if necessary.
Key Tips Just for Your GAS GAS XC300
- Check the tightness of your radiator mounting brackets. GAS GAS radiators are more vulnerable to vibration if bolts loosen up over time.
- Inspect the impeller shaft for play every season – these wear items are easy to replace and essential for efficient coolant flow.
- GAS GAS recommends changing the coolant every 12 months or more frequently if you race or ride in extreme heat.
With fresh coolant, your 2018 GAS GAS XC300 is ready to take on any trail, race, or challenge you throw at it—always running efficiently and protected from overheating. Keep MotoSport.com as your go-to resource for genuine parts, premier coolants, and all things performance for your machine!
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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.