How to Change the Coolant in a 2023 Kawasaki KX112

Shop parts for a 2023 Kawasaki KX112 Dirt Bike.

Regular coolant changes are essential for keeping your 2023 Kawasaki KX112 running cool and performing at its peak. The KX112 features a two-stroke engine with a liquid cooling system designed to handle the demands of aggressive riding and racing. Keeping fresh coolant in the system ensures optimal temperature regulation and helps prevent overheating or corrosion inside the radiator and engine passages.

What You–ll Need

  • Fresh coolant compatible with aluminum engines
  • Drain pan
  • 10 mm socket or wrench
  • Large Phillips screwdriver
  • Shop rags
  • Funnel
  • Water to flush, if needed (distilled preferred)

Step-by-Step Coolant Change Instructions

  1. Ensure the bike is cool: Never attempt to drain or fill coolant while the engine is hot, as it can cause burns and pressurized fluid release.
  2. Remove radiator cap: Locate the radiator cap on top of the left-side radiator and carefully remove it to relieve any pressure in the system.
  3. Locate and loosen bleeder screw: On KX112, there is typically a bleeder screw on the opposite radiator or a high point in the system. Loosen this with a Phillips screwdriver to prevent a vacuum lock and allow fluid to drain smoothly.
  4. Drain the system: Find the coolant drain bolt, usually at the bottom of the water pump cover on the right engine case. Place the drain pan below and completely remove the bolt using a 10 mm socket or wrench. Allow all old coolant to drain completely.
  5. Optional–Flush with water: If the coolant is dirty or you are switching coolant types, pour a small amount of distilled water into the radiator and allow it to drain to flush out any debris.
  6. Reinstall drain bolt: Inspect the sealing washer and threads for any damage, then reinstall and snug the drain bolt just enough to prevent leaks, avoiding over-tightening.
  7. Fill with new coolant: Using a funnel, slowly pour in the fresh coolant. Fill until the level reaches the bottom of the filler neck. If your model has a bleeder screw, leave it open until coolant flows out without air bubbles, then tighten it.
  8. Reinstall radiator cap: Double-check that the cap and rubber gasket are free of damage. Install cap securely until its safety lock clicks.
  9. Start and warm up engine: With the bike upright, start the engine and let it idle, watching for any leaks. Gently rev and allow to fully warm up. Shut off, let cool, and recheck coolant level–top off if necessary.

Model-Specific Tips for the KX112

  • The 2023 KX112 is engineered for maximum performance and can run at higher temperatures under heavy riding. Never substitute automotive coolant containing silicates, as it may harm the system–use dirt bike-specific coolant.
  • Check for debris around the radiators after muddy rides. Blockage can lead to overheating.
  • Inspect radiator hoses and clamps for cracking or leaks during every coolant change. Upgradable options are available for improved durability.
  • Confirm all air is bled from the system, as trapped air causes hot spots and reduced cooling efficiency.

Proper coolant maintenance will help your 2023 Kawasaki KX112 stay reliable and cool, whether you–re tearing up the track or hitting your favorite trails. If you notice frequent overheating, inspect the radiator fins, water pump, and hoses for signs of wear or failure–timely replacement can prevent costly engine repairs.

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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.