How to Change the Coolant in a 1995 Yamaha YZ250
Shop parts for a 1995 Yamaha YZ250 Dirt Bike.
Keeping your 1995 Yamaha YZ250 running smoothly requires regular maintenance, and coolant replacement is one of the most vital yet overlooked tasks. Swapping out old coolant protects your two-stroke from overheating and corrosion–especially important for the lightweight, high-rpm YZ250 engine. This MotoSport guide walks you through the exact steps and shares tips tailored to your bike.
What You Need
- Drain pan or suitable container
- 8 mm and 10 mm socket or wrench
- Phillips screwdriver (for shrouds, if needed)
- Fresh coolant: Only use a high quality ethylene glycol anti-freeze with anti-corrosion additives for aluminum engines
- Soft water or distilled water for flushing
- Copper washer (replace if damaged)
- Rags and safety gloves
Step-by-Step Coolant Change
- Wait for the engine to cool. Never work on the cooling system with a hot engine to avoid burns.
- Remove the seat and side shrouds for easier access to the radiator if necessary.
- Place a drain pan directly under the engine, beneath the coolant drain bolt on the right crankcase cover.
- Remove the radiator cap slowly to relieve any remaining pressure.
- Remove the coolant drain bolt and its copper washer. Allow all coolant to fully drain out.
- Flush the system by pouring clean tap or distilled water through the radiator cap opening until it runs clear from the drain. This helps remove any old coolant or debris from the 1995 YZ250's compact cooling system.
- Inspect the copper washer. Replace if deformed or damaged to ensure a proper seal.
- Reinstall the drain bolt and tighten to 10 Nm (7.2 ft–lb).
- Fill with fresh coolant. Use a 50/50 mix of ethylene glycol anti-freeze and soft water. The full system capacity is 1.20 L (1.27 US qt). Slowly pour the coolant into the radiator until it reaches just below the filler neck.
- Bleed the cooling system. Slightly rock the bike side-to-side and gently squeeze the radiator hoses to release air pockets.
- Reinstall the radiator cap securely.
- Reinstall shrouds and seat if removed.
- Start the engine and let it idle for several minutes. Shut it off, wait for cooling, and double–check coolant level by removing the cap and topping up if needed.
YZ250 Model Notes
- The 1995 Yamaha YZ250's cooling system is compact and sensitive to air pockets, so bleeding air is essential to prevent hot spots and potential overheating.
- Always match your coolant additive type to what has previously been used unless completely flushing out all remnants–mixing types can cause chemical reactions that harm seals and passages.
- Watch for corrosion or buildup on radiator fins, as older systems can accumulate debris that impedes cooling performance. Periodically clean exterior fins with compressed air (never water spray).
- Replacement copper washers for the drain bolt ensure a tight seal if the original is worn.
Coolant Specs for 1995 YZ250
- Coolant capacity: 1.20 L (1.27 US qt)
- Drain bolt torque: 10 Nm (1.0 m·kg, 7.2 ft–lb)
- Coolant type: 50/50 mix ethylene glycol anti-freeze with corrosion resistance for aluminum engines
Routine coolant changes every 2 years, or more frequently in harsh riding conditions, will maximize the YZ250's performance and reliability. Stay ahead on maintenance and hit the track or trails with confidence.
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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.