How to Change the Coolant in a 1987 Yamaha XT600
Shop parts for a 1987 Yamaha XT600 Dirt Bike.
Keeping your 1987 Yamaha XT600 running cool means maintaining the cooling system regularly–and that starts with changing the coolant. The XT600 is an iconic air and oil-cooled enduro, but if your model features a factory or aftermarket oil-cooling system, that oil cooler will require periodic flushing and attention as well. This guide covers the core steps to change the coolant and what XT600 owners should know.
What Makes the 1987 Yamaha XT600 Unique?
The 1987 XT600 is primarily air-cooled, relying on robust engine fins and movement for heat dissipation. Some variants and modifications may add an oil cooler, which functions similarly to a radiator but uses oil as the heat-transfer medium. If your bike has any oil-cooling circuits, refer to your service manual for specific oil flushing procedures. Otherwise, traditional liquid coolant changes are not applicable unless your XT600 is modified.
In cases where your XT600 has a liquid cooling upgrade (rare, but possible in highly customized builds), follow the instructions below.
Tools and Supplies Needed
- Quality motorcycle-specific coolant or a 50/50 pre-mixed coolant
- Distilled water (for flushing, if needed)
- Funnel
- Drain pan
- Basic hand tools to remove panels or guards, as required
- Shop towels
- Service manual for torque specs and specific procedures
Step-by-Step Guide to Changing Coolant
- Ensure the engine is cool. Never remove the coolant cap while the engine is hot–the system may be under pressure and could spray hot fluid.
- Remove seat and side covers as needed for access. For modified XT600s with a radiator or coolant reservoir, locate these components now.
- Locate the drain bolt or lower hose on the radiator (if present). Position a drain pan under the bike, then carefully remove the bolt or disconnect the hose to let old coolant drain completely. Don't forget to open the radiator cap or reservoir cap for smoother flow. If your XT600 is factory air-cooled, you will not find a drain bolt–in that case, skip coolant changes and focus on oil and air cooling maintenance.
- Flush with distilled water (optional but recommended). Reattach the drain bolt or hose. Pour distilled water into the radiator or reservoir, start the engine, and let it run for a few minutes (ensuring it doesn't overheat). Shut off, let cool, then drain again. Repeat until the drained water runs clear.
- Install a fresh sealing washer on the drain bolt. Tighten to manufacturer specs and ensure a solid seal.
- Add new coolant. Use a funnel to pour coolant into the radiator up to the base of the filler neck or to the "full" mark on the reservoir. If required, mix concentrate with distilled water per label instructions. Avoid using tap water, as it can deposit minerals inside the system.
- "Burp" the system to remove air. Start the engine with the cap off and let it run for several minutes. Gently rock the bike or rev the throttle to help air escape. Watch for bubbling as trapped air rises out. Once bubbling stops, top off if necessary and secure the cap.
- Check and top off the overflow reservoir. Fill to the upper line, reinstall the cap, and replace bodywork or covers.
- Final check. After your first ride, let the bike cool and check coolant levels again. Top off as needed.
XT600 Maintenance Notes
- If your XT600 is air-&-oil cooled, ensure the oil is clean and the system is free of leaks. Oil coolers should be flushed during major service intervals using the correct procedure for oil circuits, not coolant.
- Always dispose of old coolant responsibly–never pour it down the drain or onto the ground.
- If your system loses coolant repeatedly or overheats, inspect seals, hoses, and the radiator cap for wear or leaks, and consult your MotoSport parts source for trusted replacements.
- Regularly cleaning the exterior engine fins will maximize air cooling efficiency–compressed air works great for this.
A properly maintained cooling system or oil system is essential for performance and longevity, especially if your 1987 XT600 endures hard off-road riding. Recap: Most factory XT600 bikes from 1987 will require oil changes and air cooling maintenance, not liquid coolant changes–only follow this procedure if your model is modified with a liquid cooling system.
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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.