How to Change the Coolant in a 2014 Kawasaki KX100: Step-by-Step Guide

Shop parts for a 2014 Kawasaki KX100 Dirt Bike.

Regular coolant changes are essential for the 2014 Kawasaki KX100 to ensure maximum engine performance and protection. The KX100 uses a liquid-cooled system which, if neglected, may result in overheating or corrosion–major threats to two-stroke reliability and power delivery. Below is a proprietary MotoSport process for changing the coolant on your 2014 KX100, with important safety and model-specific notes included.

Refresh Coolant: Preparation & Safety

  • Ensure the engine is completely cool. Coolant can be extremely hot and cause severe burns if the system is opened while hot. It is also toxic and slippery, so keep it off your skin, and clean spills immediately.
  • Gather supplies: new coolant meeting Kawasaki's recommended type (permanent-type antifreeze: soft water and ethylene glycol plus inhibitors, with a 50:50 mix), catch pan, funnel, 10mm socket, and clean water for flushing (if switching coolant type).

Step 1: Access Radiator & Drain Bolt

  • Remove the KX100's radiator cap. Turn slowly to relieve any remaining pressure, being prepared for possible outgassing. (Again, engine must be cool.)
  • Locate the coolant drain bolt on the lower side of the cylinder. Position a catch pan to avoid a mess and loosen the bolt with your 10mm socket.
  • For a thorough drain, carefully tilt the motorcycle to help coolant exit fully.

Step 2: Flush System (If Needed)

  • If you are switching between coolant types (e.g., from water-based to ethylene glycol), flush the system by replacing the drain bolt, refilling the radiator with clean water, running the engine briefly, and draining again. Repeat as needed until clean water emerges. Avoid leaving any water in the system–compressed air can help clear hoses if desired.

Step 3: Refit and Fill

  • Reinstall and tighten the drain bolt. Recommended torque for the air bleeder bolt is 9.4 Nm (83 in-lb), so apply similar caution for the drain bolt. Do not overtighten.
  • Slowly fill the radiator with the 50:50 coolant mixture, up to the bottom of the filler neck. Do not overfill.

Step 4: Bleed Air from System

  • On the KX100, it is important to remove air pockets that could cause hot spots. Loosen the air bleeder bolt on the cylinder head until coolant flows out, then retighten to specified torque.
  • Tap radiator hoses gently to help trapped air escape. Check and top up the coolant if necessary.

Step 5: Inspection and Final Steps

  • Start the bike and let it idle. Watch for leaks and observe coolant level–as the thermostat cycles and air is purged, top up as needed. If equipped with a radiator overflow tank, check that it is filled to the correct level.
  • Allow bike to fully warm up, then cool before reopening the radiator cap to confirm level.
  • Dispose of old coolant safely. It is toxic to humans and animals and must never go down household drains.

Model-Specific Notes for the 2014 KX100

  • Total coolant system capacity is 0.57L (0.60 US qt).
  • Always use aluminum-safe coolant with corrosion inhibitors–the KX100's radiator and water pump are sensitive to the wrong product.
  • Green coolant is typically correct, matching OEM spec.
  • Periodic inspection is especially important after heavy rides or tip-overs, as KX models are more prone to overheating if coolant is low or contaminated.
  • Note that overfilling can result in the cooling system blowing out excess coolant–always fill to the base of the neck, not over.

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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.