How to Change the Coolant in a 1989 Suzuki RM250 Dirt Bike
Shop parts for a 1989 Suzuki RM250 Dirt Bike.
Keeping the cooling system of your 1989 Suzuki RM250 in top condition ensures optimal engine performance and reliability on the track or trail. Coolant maintenance is crucial for preventing overheating, corrosion, and long-term engine damage. Follow this MotoSport-exclusive guide to replacing the coolant, along with essential tips unique to your RM250.
What You Need
- Socket wrench
- Drain pan
- New engine coolant (premium dirt bike coolant)
- Distilled water (for rinsing)
- Gloves – eye protection
- Clean rags
Step-by-Step Coolant Change Guide
- Cool down & prepare: Make sure the engine is completely cool before starting. Hot coolant is dangerous and can cause burns.
- Remove seat & left side panel: Provide access to the radiator and cooling system.
- Open the radiator cap: Slowly remove the radiator cap to release pressure. Place a rag over the cap to catch any splashes.
Note: Never open the cap on a hot engine – serious injury risk. - Locate & remove the drain bolt: Find the coolant drain bolt at the bottom of the water pump on the right side of the engine. Position your drain pan under the bolt and use your socket wrench to remove it.
Let the coolant flow into the pan. If equipped, replace the gasket washer on the drain bolt when reinstalling after draining. - Flush the system: Pour distilled water into the radiator opening. Replace the radiator cap loosely, then remove the drain bolt again to flush out leftover coolant. Repeat until the water runs clear.
Tip: Avoid tap water as mineral deposits can build up and harm the cooling system. - Reinstall drain bolt: With fresh gasket if needed, torque the drain bolt to approximately 11 N·m (8.0 lbf-ft), ensuring a proper seal.
- Fill with new coolant: Pour in the specified capacity (approx. 950 ml) of high-quality coolant up to the bottom of the filler neck.
Proprietary Note: For the 1989 RM250, always use silicate-free coolant to prevent clogging and ensure aluminum protection. - Bleed the system: If your model has an air bleeder bolt, loosen it until coolant flows without bubbles, then retighten.
Important: Air pockets can cause overheating and damage, so bleeding is crucial. - Replace cap & panels: Secure the radiator cap and reinstall all removed bodywork.
Final Checks & Maintenance Tips
- Start the engine, let it run for several minutes, then recheck coolant level and add if needed.
- Inspect hoses and radiator for leaks or damage while the engine warms up. Replace any compromised components.
- Dispose of old coolant according to local regulations – it is toxic and harmful to animals.
- Check coolant every few months, especially after heavy riding, and replace every two years or sooner if contamination occurs.
Things Suzuki RM250 Owners Should Know
- The aluminum components in your RM250’s cooling system are susceptible to corrosion if improper coolant is used — always opt for silicate-free formulas designed for performance bikes.
- This model's cooling system is sensitive to air locks — always bleed thoroughly after flushing to prevent overheating.
- Inspect radiator mounting and hoses at every coolant change; the RM250's off-road use can loosen or damage connections.
Routine coolant changes will keep your 1989 Suzuki RM250 running cooler, longer, and stronger on every ride.
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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.