How to Change the Coolant in a 1987 Kawasaki KD80
Shop parts for a 1987 Kawasaki KD80 Dirt Bike.
Changing the coolant in your 1987 Kawasaki KD80 is a crucial maintenance task that helps preserve the engine’s longevity and prevents overheating during those tough off-road rides. While the KD80’s air-cooled engine means it doesn’t use liquid coolant like some more modern or larger bikes, certain KD80 variants – especially if equipped with aftermarket or region-specific modifications – might have a simple, sealed liquid-cooling system. If your KD80 does feature a liquid cooling system, or you use these instructions for a similar Kawasaki youth two-stroke, follow this specialized MotoSport guide to do the job right.
What Makes the 1987 Kawasaki KD80 Unique?
The KD80 was built for younger or smaller riders, featuring a lightweight chassis, easy handling, and a simple two-stroke engine design. For most, it came air-cooled, but check your specific model. If your bike features a liquid cooling system, follow these steps; if not, routine air-cooling maintenance (cleaning fins, proper airflow) remains essential.
Tools & Supplies You Will Need
- Coolant suitable for motorcycles (check that it’s safe for aluminum components – a 50/50 pre-mix of ethylene glycol and distilled water is standard)
- Drain pan
- Socket set or wrenches
- New sealing washer for the drain bolt (recommended)
- Funnel (preferably a long-necked style for motorcycles)
- Shop rags
- Phillips screwdriver
- Distilled water (for flushing, if needed)
- Splash protection (gloves & safety glasses)
Step-by-Step Coolant Change Process
- Preparation: Place your KD80 securely on a stand. Make sure the engine is cool to prevent burns.
- Access the Cooling System: Remove the seat and side panels as needed to reach the radiator cap and system components.
- Drain Old Coolant: Position the drain pan under the water pump or bottom radiator hose. Loosen the drain bolt on the bottom of the system (or remove the lower hose if no bolt is present). Let all fluid drain completely, and remove the radiator cap for faster flow.
- Flush the System (Optional but recommended): Pour distilled water into the radiator fill neck, reinstall the drain bolt loosely, and let it circulate by briefly starting the engine (only if safe to do so for your model). Turn off the engine and drain out the water. Repeat if the water drains out dirty.
- Replace the Drain Bolt & Washer: Fit a new sealing washer on the drain bolt and tighten it to the recommended spec.
- Add New Coolant: Using your funnel, pour the fresh coolant slowly into the radiator filler. Avoid overfilling—add gradually to prevent air pockets and spills.
- Fill the Expansion Tank: If equipped, top off the expansion tank to the upper fill line.
- Burp the System: Start the engine with the radiator cap off. Let it idle for 2–3 minutes and blip the throttle several times to circulate coolant and release trapped air. Check and top up the radiator level as needed.
- Final Checks: Turn off the engine, let it cool, and recheck the coolant levels at the filler neck and expansion tank. Top up if necessary before reinstalling the radiator and expansion tank caps.
- Inspect for Leaks: Check all hoses and the drain bolt for any sign of leaks. Ensure caps and panels are securely reinstalled.
Important Notes for KD80 Owners
- Most 1987 KD80s are air-cooled. Only follow these cooling system maintenance steps if your bike has been modified or is a rare liquid-cooled variant.
- Disposal: Used coolant is toxic. Always dispose of old coolant properly–never pour it down the drain or onto the ground.
- Monitor Levels: After the first ride, double-check coolant levels once the engine is cold. Small air pockets may work free and levels might drop slightly after initial maintenance.
- Prevent Overheating: Clean your radiator fins and ensure airflow isn’t blocked by debris or bent fins–this keeps your KD80 running cool on the trail.
Keeping the cooling system on your 1987 Kawasaki KD80 in top shape is key to performance and reliability. MotoSport carries all the parts for a 1987 Kawasaki KD80 Dirt Bike. and offers expert advice for every step of your dirt bike journey. If you have any doubts about your KD80’s cooling system configuration, consult your owner’s manual or reach out to a MotoSport support specialist before starting this service.
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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.