How to Change the Coolant in a 1998 Honda CR250
Shop parts for a 1998 Honda CR250 Dirt Bike.
Keeping your 1998 Honda CR250 running cool is key to engine performance – and longevity. Whether you hit the track or the trails, replacing the coolant at least once a year helps prevent overheating and corrosion. This step-by-step MotoSport.com guide is customized for your CR250's unique design so you can finish the job quickly and ride with confidence.
What Makes the ྞ CR250's Cooling System Unique?
The 1998 CR250 features a single-piece radiator design mounted right behind the front fender, which leaves it more exposed than newer bikes with split radiators. Always inspect the radiator for bent fins and leaks anytime you change coolant. These models are also sensitive to coolant levels and pressure, so maintaining the right volume and a good radiator cap seal is crucial for preventing overheating during aggressive riding.
What You Need
- New coolant (use high-quality ethylene glycol based coolant designed for aluminum engines)
- Catching pan
- 10mm socket or wrench
- Flathead screwdriver
- Clean rags
- Optional: compressed air for flushing
- Optional: new crush washer for the drain bolt
Step-by-Step Coolant Change Instructions
- Let the engine cool completely. For safety & to avoid burns, never work on the bike when warm.
- Remove the seat and gas tank. Loosen and remove the seat and tank using your sockets and screwdriver to access the radiator and hoses more easily.
- Take off the radiator cap. Open the radiator cap – this helps coolant drain freely by releasing pressure.
- Position the drain pan under the water pump's lower cover. On your 1998 CR250, the coolant drain is the bottom bolt on the water pump cover (right side of engine, just beneath the clutch cover).
- Remove the drain bolt on the water pump cover. Let the coolant fully drain into your pan. It can take a few minutes. Inspect the old coolant for contamination or oil, which may indicate a gasket failure.
- Inspect hoses & radiator for cracks, corrosion, or kinks. Tighten hose clamps if loose, and consider replacing brittle hoses at this stage.
- Optionally flush the system. If you are switching coolant types or the old fluid is very dirty, use clean water or compressed air to flush the system, then re-drain completely.
- Reinstall the drain bolt using a new crush washer if available. Tighten securely, but do not overtighten.
- Slowly add new coolant into the radiator until it reaches the top. Gently rock the bike to release trapped air. Top off as needed.
- Leave the cap off and start the engine. Let the bike idle for 2–3 minutes to help any air bubbles escape. Watch the coolant level and add more if it drops.
- Reinstall the radiator cap securely.
- Double-check for leaks at all hoses and the drain bolt. Reinstall your gas tank and seat.
Coolant Capacity Tip
The CR250 requires about 1 quart (0.95 L) during a standard coolant change. Always use coolant compatible with magnesium and aluminum, and never run pure water for extended periods.
Final Notes
- If the radiator fins are clogged with debris, gently clean them with compressed air from the engine side out.
- Never mix different coolant types.
- Inspect the radiator cap seal; a weak cap is a common cause of overheating on older models.
- Dispose of old coolant responsibly to protect the environment.
For replacement coolant, hoses, or any other parts for your 1998 Honda CR250, MotoSport.com has you covered.
Related Shopping Categories
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Shop Tools for a 1998 Honda CR250 Dirt Bike.
Shop Radiator Hoses for a 1998 Honda CR250 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.