How to Change the Coolant in a 2016 Kawasaki KX85
Shop parts for a 2016 Kawasaki KX85 Dirt Bike.
The 2016 Kawasaki KX85 is a top choice for aspiring motocross riders and performance-focused youth. Routine coolant changes will keep your bike running cool, prevent overheating, and extend the life of your engine and cooling system. The KX85 features dual radiators and a high-revving two-stroke engine, making reliable cooling essential for race days and long trail sessions. Here's a complete, proprietary MotoSport guide to replacing your coolant with confidence and care for your 2016 KX85.
Things You'll Need
- Fresh pre-mixed motorcycle coolant (ensure it's compatible with aluminum radiators).
- 10mm and 8mm socket or wrench.
- Large drain pan to catch old coolant.
- Funnels for controlled pouring.
- Rags to wipe any spills.
- Gloves – coolant is slippery and toxic.
- Compressed air (recommended for full flush if changing coolant type).
Before You Begin
- Only change coolant when the engine is completely cool – hot coolant can cause burns and high system pressure can spray fluid.
- Work in a well-ventilated area and keep pets and kids away – used coolant is toxic.
Step 1: Drain the Old Coolant
- Remove the radiator shrouds using your 8mm wrench if needed for better access.
- Locate the radiator cap at the top of the left side radiator. Do not open it yet.
- Place the drain pan below the water pump cover (right side near the bottom of the engine).
- Loosen, then remove the 10mm coolant drain bolt located at the bottom of the water pump cover. Some KX85 models have a small copper washer here – ensure you don't lose it.
- Open the radiator cap slowly now to allow the system to vent and drain completely.
- Gently tilt the bike side to side to ensure all coolant drains.
Optional: Flush the Cooling System
- If switching coolants or if the old coolant is dirty, flush the system with distilled water.
- Replace the drain bolt, fill radiator with distilled water, run the bike for a few minutes, let it cool, and drain again.
- For a full flush, remove the lower radiator hose and use compressed air carefully to blow out any remaining fluid from the system.
Step 2: Refit – Prepare for Filling
- Inspect the drain bolt and copper washer; replace if damaged.
- Reinstall and gently torque the coolant drain bolt. Do not overtighten – hand snug is usually sufficient.
Step 3: Fill with New Coolant
- Using a funnel, slowly fill the radiator with the recommended pre-mixed coolant to the base of the filler neck.
- Tap the radiator hoses gently by hand to help any trapped air bubbles rise and escape.
- Squeeze the main radiator hose a few times, then top off with coolant if the level drops.
Step 4: Bleed – Remove Air
- With the radiator cap off, briefly start the bike and let it idle for 30-60 seconds, watching for coolant movement (do not rev or let it overheat).
- Watch for bubbles – this means trapped air is escaping. Shut off engine, let sit, and top off if needed.
- Securely reinstall the radiator cap, ensuring it clicks into the locked position. Do not overfill – overfilling reduces efficiency.
Step 5: Final Checks
- Clean any coolant drips, refit shrouds, and start the engine. Check for leaks as it comes to temperature.
- After your first ride, re-check coolant level – top off if necessary as air may continue to work its way out.
Important Notes for 2016 KX85 Owners
- The 2016 KX85 uses dual aluminum radiators which are high efficiency but can clog if old or contaminated coolant is left in the system.
- Never use regular automotive coolant designed for older vehicles with copper or brass systems – always use a coolant specifically labeled as safe for motorcycles with aluminum components.
- Coolant should be inspected every 20 hours of use, and replaced at least once per season – more often if you ride in hot, sandy, or muddy conditions.
Disposal – Be Responsible
- Do not pour used coolant down the drain or on the ground. Collect all old coolant in a sealed container and take it to a recycling center or auto parts store that accepts waste fluids.
Keep your KX85 running like a champion by making coolant changes part of your routine maintenance – and rely on MotoSport for all parts, upgrades, and support.
Related Shopping Categories
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Shop Temperature Sensors for a 2016 Kawasaki KX85 Dirt Bike.
Shop Tools for a 2016 Kawasaki KX85 Dirt Bike.
Shop Radiator Hoses for a 2016 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.