How to Change the Coolant in a 2015 Kawasaki KX85 (MotoSport Exclusive Guide)
Shop parts for a 2015 Kawasaki KX85 Dirt Bike.
Keeping your 2015 Kawasaki KX85 in top shape means ensuring proper cooling system maintenance. Coolant not only keeps your engine from overheating, it also protects internal components from corrosion and wear. For the KX85, changing the coolant regularlytypically every season or 40–50 hours of useis essential for peak performance and engine longevity.
What You Need
- Fresh, motorcycle-specific coolant (avoid automotive coolant)
- 10mm socket or wrench
- Phillips screwdriver
- Rags for cleanup
- Drain pan or container
- Funnel
- Gloves and safety glasses (recommended)
Before You Start
- Ensure the bike is completely cool before removing the radiator cap. The coolant system can reach high pressure when hot, risking severe burns.
- Always work in a well-ventilated area and avoid skin contact with coolantit is toxic and slippery.
Step-by-Step Coolant Change Process
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Remove the Radiator Cap
Unscrew the radiator cap slowly to relieve any residual pressure in the system. On the KX85, the cap is located at the top of the left radiator. If your KX85 has a radiator bleeder screw on the opposite side, remove it with a Phillips screwdriver to prevent a vacuum lock and allow fluid to drain smoothly. -
Locate and Remove the Drain Bolt
Find the coolant drain bolt on the water pump cover (use the 10mm socket/wrench). Place the drain pan underneath and remove the bolt completely. Watch for the coolant to start draining; tilting the bike slightly can help evacuate all old coolant from both radiators and the engine. -
Flush the System (Optional for Thorough Maintenance)
To fully flush the systemespecially if changing coolant typespour a small amount of distilled water into the radiator and reinsert the drain bolt loosely. Start the engine briefly to help circulate, then drain completely. -
Reinstall the Drain Bolt
Double-check the drain bolt washer for wear. Tighten the drain bolt securely to avoid leaks, but do not overtighten (check your owner's manual for torque specs). -
Add New Coolant
Using your funnel, pour the fresh coolant slowly into the radiator until it's nearly full. If the bike has a bleeder screw, close it once coolant begins to flow out to remove trapped air. -
Bleed the System
With the radiator cap off, start the engine for 15–30 seconds, then shut it off. This helps circulate coolant and release any air bubbles. Top off coolant if the level drops. -
Final Checks
Reinstall the radiator cap securely. Wipe up any spills and check for leaks around the drain bolt and radiator seams. Run the engine to operating temperature and verify coolant level again, topping off if necessary.
KX85 Model-Specific Notes
- The KX85's radiator is relatively exposedinspect for damage or bent fins before refilling.
- Never use straight water or automotive coolants containing silicate, as these can corrode magnesium engine parts commonly used on the KX85.
- If you ride in muddy or sandy conditions, check your radiator more frequentlythe small radiators are susceptible to clogging and debris buildup.
Disposal of Old Coolant
Never pour old coolant down the drain or onto the ground. Bring it to a local hazardous waste facility or automotive shop that accepts coolant for recycling.
Maintenance Tip
Check hoses and the radiator cap for signs of wear during every coolant change. Early replacement can prevent leaks during a race or trail ride.
Proper coolant maintenance on your 2015 KX85 means more time riding, less time in the shop, and protecting your engine for seasons to come.
Related Shopping Categories
Shop Radiators for a 2015 Kawasaki KX85 Dirt Bike.
Shop Coolant for a 2015 Kawasaki KX85 Dirt Bike.
Shop Temperature Sensors for a 2015 Kawasaki KX85 Dirt Bike.
Shop Tools for a 2015 Kawasaki KX85 Dirt Bike.
Shop Radiator Hoses for a 2015 Kawasaki KX85 Dirt Bike.
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.