How to Change the Coolant in a 2008 KAWASAKI KLX110

Shop parts for a 2008 Kawasaki KLX110 Dirt Bike.

Changing the coolant on your 2008 Kawasaki KLX110 is an essential maintenance task that ensures your engine stays properly cooled and protected, especially during long trail rides or summer heat. The KLX110's air-cooled 4-stroke engine doesn't feature a radiator like larger liquid-cooled bikes, so owners only need to pay attention to the small quantity of coolant in the overflow reservoir if one is fitted (later models may not have a separate coolant reservoir, but some owners add one for specific riding needs). Below is a step-by-step proprietary MotoSport guide tailored specifically for your KLX110.

Tools – What You Need

  • 8mm and 10mm socket or wrench (for plastics and hardware)
  • Pliers (for hose removal if needed)
  • Drain pan
  • Distilled water (for flushing)
  • Fresh, compatible motorcycle coolant (consult your manual for specifications, non-silicate/non-borate formulations preferred)
  • Funnel
  • Shop rags

Preparation

  • Park the KLX110 on a stable, level surface with the engine completely cool before beginning work.
  • Remove the seat and side panels using the 8mm or 10mm socket, as directed in your owner's manual. This gives access to any reservoir or overflow bottles and coolant hoses.

Drain Old Coolant

  • Locate the coolant overflow bottle, usually mounted on the frame near the engine or behind a side panel.
  • Remove the overflow hose and allow any fluid inside the reservoir to drain completely into the pan. If your KLX110 has no bottle or hoses, move to flushing the system below.

Flush the System

  • Flush sediment or remaining old coolant by pouring a small amount of distilled water into the reservoir and gently tilting the bike side-to-side to help rinse it through.
  • Reconnect the hoses and allow the rinse to drain, then repeat if needed until the water runs clear.

Refill With Fresh Coolant

  • Using a funnel, fill the overflow reservoir up to the recommended "Full" line with your choice of new motorcycle coolant.
  • Ensure all hoses are securely reattached and clamps are tight.
  • Reinstall the side panels and seat once everything is clean and dry.

Final Steps

  • Start the engine and let it idle for a few minutes to allow any trapped air to escape and the coolant to circulate.
  • Shut off the bike, let it cool, then recheck fluid level in the reservoir, topping up if necessary.

KLX110 Owner’s Tips & Considerations

  • The 2008 KLX110 is factory-equipped as an air-cooled model. If your bike has been modified with aftermarket cooling accessories, double-check all unique plumbing during your service.
  • Always use distilled water for flushing to prevent scale and corrosion.
  • Never use automotive coolant with silicates, as this can damage seals designed for motorcycle coolant.
  • If storing the bike or riding in freezing temperatures, always confirm your coolant offers freeze protection.

Routine coolant replacement, even on a small-bore machine like the KLX110, helps preserve engine performance – and keeps you riding longer between major services.

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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.