How to Change the Coolant in a 2006 Kawasaki KLX125
Shop parts for a 2006 Kawasaki KLX125 Dirt Bike.
Proper coolant maintenance is key to keeping your 2006 Kawasaki KLX125 running cool & reliable on every ride. This step-by-step guide will walk you through the coolant change process, highlight the tools needed, and note important details unique to this model.
What Makes the 2006 Kawasaki KLX125 Coolant System Unique
- The KLX125 uses a simple, single-cylinder liquid-cooled engine, making coolant changes straightforward.
- The coolant drain bolt is located on the bottom of the water pumpeasy to access with basic hand tools.
- This model features an overflow reservoir mounted on the left side, which should also be emptied and cleaned during a coolant change.
Tools & Supplies
- 8mm and 10mm sockets & ratchet
- Phillips screwdriver
- Drain pan
- Funnel
- New, motorcycle-specific, silica-free coolant
- Distilled water (for flushing, optional but recommended)
- Clean rags for any spills
How to Change the Coolant
- Prep the bike: Ensure the engine is cool to the touch. Place the bike on a stand or level ground.
- Remove seat & side panel: Use an 8mm socket to remove the left side panel. This lets you access the overflow reservoir.
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Drain the radiator:
- Remove the radiator cap (right side, next to the steering stem) using a cloth for grip if needed.
- Locate the water pump at the bottom right of the engine. The drain bolt is typically a 10mm bolt at the lowest point.
- Place your drain pan under the water pump and slowly remove the drain bolt. Allow all old coolant to drain.
- Empty the overflow reservoir: Detach the overflow reservoir if necessary. Tip out any old coolant. Clean with distilled water if sludge or deposits are visible.
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Flush (optional but recommended):
- Thread the drain bolt back in temporarily (do not over-torque).
- Fill the radiator and reservoir with distilled water.
- Run the engine for a minute, then shut off and let cool. Drain all water completely.
- Repeat if coolant was very dirty or old.
- Install the drain bolt: Secure the drain bolt back in place. Do not overtightensnug is sufficient for the small bolt in the KLX125's aluminum pump.
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Refill with new coolant:
- Use a funnel to carefully fill the radiator with recommended coolant until full.
- Add coolant to the overflow reservoir to the indicated "Full" line.
- Leave the radiator cap off for now.
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Bleed air from the system:
- Start the engine and let it idle for 2-3 minutes. Gently rock the bike side to side to help air bubbles escape.
- Watch for drop in coolant level; top off as needed.
- Once bubbles stop rising and coolant remains steady, shut off the engine. Allow to cool, check level again, and add as needed.
- Reinstall the radiator cap and side panel: Ensure the radiator cap is fully secured. Replace the left side panel and seat.
- Check for leaks & Dispose of old coolant: Run the engine briefly. Inspect around the water pump and radiator. Dispose of old coolant at an approved recycling location.
Extra Tips for 2006 KLX125 Owners
- Always use coolant formulated for motorcyclesnever plain tap water or automotive antifreeze with silicates, which can damage your KLX125's water pump and gaskets.
- Check the radiator cap for signs of wear or swelling. A faulty cap can cause overheatinga known weak point on older bikes.
- Regular coolant changes (every 2 years or 6,000 miles) keep your system free of corrosion and running strong.
- If your KLX125 has been stored or run hard in harsh environments, inspect radiator hoses for cracking or bulges. Replace as necessary for best results.
Keeping the coolant fresh in your 2006 Kawasaki KLX125 is a simple job that pays off with longer engine life and more confidence on any trail.
Related Shopping Categories
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Shop Radiator Hoses for a 2006 Kawasaki KLX125 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.