How to Change the Coolant on a 1989 Yamaha YZ250
Shop parts for a 1989 Yamaha YZ250 Dirt Bike.
Regular coolant changes are essential for keeping your 1989 Yamaha YZ250 running strong, preventing overheating, and protecting the engine's internal components. This step-by-step guide explains how to change the coolant and includes key model-specific tips every YZ250 owner should know.
What You'll Need
- High quality ethylene glycol-based coolant with anti-corrosion additives for aluminum engines (mix 50/50 with distilled water)
- Socket wrench set
- Copper washer (replace if required)
- Catch container (min. 2 liters capacity)
- Funnel
- Clean rags
- Gloves & safety glasses
Steps to Change the Coolant on a 1989 Yamaha YZ250
- Ensure the engine is cool. Never open the radiator cap or drain coolant when hot to avoid burns.
- Locate the coolant drain bolt. On the 1989 YZ250, this is found at the lowest point of the water pump cover on the right side of the engine.
- Place a container under the engine to catch the old coolant.
- Remove the radiator cap. This allows air in, so coolant drains faster and more completely.
- Remove the drain bolt and copper washer. Once loose, old coolant will begin to flow out.
- Fully drain the system. Tilt the bike side to side to ensure as much coolant as possible empties from radiators and engine cavities.
- Flush the cooling system. With the drain bolt out, pour clean distilled water into the radiator to wash out residues. Allow to completely drain. Repeat until clear water exits.
- Reinstall the drain bolt with copper washer. Tighten to 10 Nm (7.2 ft–lb).
- Pour in fresh coolant. Use a 50/50 mix of ethylene glycol concentrate and distilled water. Total cooling capacity is 1.2 L (1.27 US qt). Fill until the coolant level reaches the bottom of the radiator filler neck.
- Bleed air from the system. With the cap still off, gently rock the bike and squeeze the radiator hoses to dislodge trapped air bubbles. Top up if the level drops.
- Replace the radiator cap. Make sure it's secured tightly.
- Start the engine and let it idle for a few minutes. Check for leaks and watch the coolant level. Turn engine off and allow to cool, topping up as needed.
- Properly dispose of old coolant at an authorized recycling or waste center.
Model–Specific Tips for the 1989 Yamaha YZ250
- Copper washer: Inspect and replace if deformed or damaged to prevent leaks upon reassembly.
- Weep hole check: Frequently inspect the weep hole under the water pump. Any coolant leakage may indicate a worn mechanical seal or bearing, common on older YZ250s and worth addressing during coolant changes.
- Coolant mix: Always use a coolant approved for aluminum engines and never straight water, which can cause corrosion and inadequate cooling.
- Radiator care: Clean debris from the radiator fins and inspect them for bends or clogging to maximize cooling efficiencya critical point for air-cooled 2-stroke engines like the YZ250.
Why Regular Coolant Changes Matter
- Prevents overheating, especially under demanding riding conditions.
- Protects engine and radiator from internal corrosion.
- Extends the life of water pump seals and internal components.
For any replacement radiator parts, gaskets, or coolant supplies, MotoSport stocks a full selection of OEM and aftermarket solutions specifically for your 1989 YZ250. Routine maintenance ensures legendary Yamaha reliability 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.