How to Change the Coolant in a 2013 Kawasaki KLR650

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Keeping your 2013 Kawasaki KLR650 running strong means regular coolant changes to protect the engine from overheating and internal corrosion. This DIY guide breaks down the steps for flushing and replacing your KLR650 coolant, highlighting specific details KLR owners should know about this model.

Why Coolant Changes Matter for the KLR650

The KLR650 is renowned for its reliability, but the liquid-cooled single-cylinder engine depends heavily on clean coolant to avoid thermal stress–especially under off-road or ADV conditions where dirt, mud, and slow riding can cause temps to rise. A neglected cooling system can result in overheating or even internal engine damage. Unlike some dual-sport bikes, the KLR650 has a compact radiator and a reservoir tucked behind the right fairing, so proper maintenance is a bit different from air-cooled models.

What You Need

  • Fresh coolant (use Kawasaki-branded or any high-quality silicate-free, ethylene glycol-based coolant safe for aluminum engines)
  • Distilled water (for flushing)
  • Phillips and flathead screwdrivers
  • Socket set
  • Catch pan for old coolant
  • If available: manual or vacuum pump for extracting coolant from the reservoir
  • Protective gloves & rags

Step-by-Step Coolant Change for the 2013 KLR650

  1. Cool Down the Engine: Make sure the bike is completely cool before starting. Hot coolant can cause burns.
  2. Access the Radiator and Reservoir: Turn the handlebars fully right to reach the radiator reservoir cover on the right side. Remove the two Phillips screws securing the cover. Set the cover and screws aside for reinstallation later.
    If you remove the reservoir, use care not to damage hoses or plastic mounting tabs.
  3. Drain Old Coolant:
    • Place a drain pan under the water pump (left side). Loosen, then remove the coolant drain bolt–typically found at the lowest point on the water pump case–and its sealing washer.
    • Remove the radiator cap (top left of the radiator) after opening the drain bolt, to allow coolant to flow out smoothly.
    • If equipped, disconnect the reservoir hoses and tilt or extract leftover coolant, either by carefully inverting the tank or using a vacuum pump.
  4. Flush the System:
    • Install the drain bolt temporarily. Fill the radiator with distilled water and reinstall the cap.
    • Start the bike and let it briefly run up to operating temperature (monitor closely) to circulate the water, then shut down.
    • Repeat the draining procedure, then flush again if the water looks dirty. Clean, clear water means flushing is complete.
  5. Refill with Coolant:
    • Install the drain bolt (use a new washer if possible; torque appropriately to avoid leaks).
    • Fill the radiator with pre-mixed coolant up to the base of the filler neck.
    • Fill the reservoir tank up to the "Full" line.
  6. Bleed Air from the System:
    • Start the engine and let it run until it reaches operating temperature. Watch for air bubbles escaping at the radiator.
    • When the engine is hot and the thermostat cycles, coolant will begin to flow, expelling trapped air.
    • The level in the reservoir may drop as the system purges, so shut the engine down, let it cool, and top up both the radiator and reservoir as needed.
    • This bleed-and-top-up cycle may need to be repeated once or twice before air is fully expelled. Persistent air in the system can indicate deeper issues.
  7. Inspect System for Leaks: Carefully check around the drain bolt, radiator cap, and hoses for leaks. Wait until the engine is fully cool to recheck coolant levels.
  8. Reassemble Bodywork: Reinstall the reservoir tank cover using medium-strength threadlocker on mounting screws (recommended), and replace any body panels or skid plate you may have removed.

KLR650 Owner Notes

  • The KLR650's coolant system is robust, but older bikes may develop leaks at hose connections or reservoir seams. Replace cracked hoses and cap seals as needed.
  • If you ever notice coolant in the oil or vice versa, suspect a failed head gasket–this is uncommon but not unheard of on high-mileage KLRs.
  • Stick with the factory coolant type/spec to avoid corrosion of the alloy components.
  • Always dispose of old coolant responsibly–ethylene glycol is toxic to animals and the environment.

Stay on top of your routine coolant services and the 2013 KLR650 will handle everything from single-track to cross-country touring. Maintain your cooling system now to ensure confidence on any adventure.

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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.