How to Change the Coolant in a 2020 Kawasaki KX65

Shop parts for a 2020 Kawasaki KX65 Dirt Bike.

Changing the coolant on your 2020 Kawasaki KX65 is a simple but crucial part of regular dirt bike maintenance. This model uses a liquid-cooling system that keeps your engine running at optimal temperatures even during aggressive rides. Fresh coolant helps prevent overheating and internal corrosion, ensuring your KX65 stays in peak condition out on the track or trail. Below you will find a step-by-step proprietary MotoSport guide tailored specifically to your KX65, including important tips and best practices.

Tools & Supplies Needed

  • 10mm socket or wrench
  • Large Phillips screwdriver
  • Catch pan or container for old coolant
  • Clean funnel
  • Fresh dirt bike coolant (avoid automotive coolant)
  • Rags for cleanup
  • Distilled water (recommended for flushing)
  • Protective gloves

Key Notes for the 2020 KX65

  • The KX65 has a compact radiator system designed for lightweight performance. Always use dirt bike-specific coolant to avoid chemical reactions or silicate build-up that could damage the water pump and engine components.
  • The radiator cap is under pressure when hot. Never attempt to remove the cap until the bike is completely cool to avoid burns from hot coolant spray.
  • The cooling system capacity is relatively small, so careful measurement and slow filling prevent trapped air pockets.

Step 1: Ensure the Engine is Cool

Always let the engine cool fully before starting. Hot coolant can cause serious burns.

Step 2: Remove Protective Components

  • If your bike has a skid plate, use a socket or wrench to remove it for better access to the water pump and drain bolt.
  • Locate the radiator under the left side plastics; removing the radiator shroud may improve access.

Step 3: Open the Radiator Cap

  • With the engine cool, twist off the radiator cap to relieve pressure and allow faster draining.

Step 4: Drain the Old Coolant

  • Locate the water pump drain bolt at the bottom of the right crankcase cover.
  • Place your catch pan underneath, then carefully remove the bolt and allow coolant to fully drain.
  • To improve drainage, gently tilt the bike side to side.

Step 5: Optional – System Flush

  • For best results, pour distilled water into the radiator, re-install the drain bolt, and run the engine for 30 seconds. Then repeat the drain process to flush out any residual debris or old coolant.
  • Never use tap water due to high mineral content – distilled is best to prevent mineral deposits.

Step 6: Reinstall the Drain Bolt

  • Clean the drain bolt and sealing surface. Inspect for wear. Reinstall and snug it (do not overtighten).

Step 7: Add Fresh Coolant

  • Use a funnel to slowly pour the recommended dirt bike coolant into the radiator, filling until the fluid just reaches the bottom of the cap neck.
  • Allow air bubbles to escape by gently tapping the radiator and squeezing the hoses.

Step 8: Bleed the System

  • On the KX65, removing the small bleed screw or gently loosening a radiator hose clamp at the highest point can help ensure all air is out of the system.
  • Once coolant emerges from the bleed, re-tighten the screw or clamp.

Step 9: Replace Radiator Cap and Test

  • Reinstall the radiator cap securely.
  • Start the bike and let it idle for a few minutes, then shut it off and let cool.
  • Recheck the coolant level once more, topping off if needed after air has worked itself out.

Step 10: Inspect for Leaks

  • Inspect drain bolt, water pump, and hose connections. Tighten any fittings if seepage is noticed.

Owner Tips for the 2020 KX65

  • Check your coolant level before each ride to avoid overheating issues – especially crucial since the KX65 often sees high RPM operation by younger riders.
  • Inspect hoses regularly for bulges or cracks. Replace at any sign of deterioration.
  • Coolant should be changed at least once per year or sooner with heavy use, as off-road conditions accelerate contamination.
  • Proper coolant disposal is critical – always take used coolant to a recycling center.

Following these steps will keep your KX65's cooling system operating efficiently, reduce the risk of engine damage, and give you peace of mind for every ride.

Related Shopping Categories

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Shop Radiator Hoses for a 2020 Kawasaki KX65 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.