How to Change the Coolant in a 1982 Yamaha IT250
Shop parts for a 1982 Yamaha IT250 Dirt Bike.
The Yamaha IT250 from 1982 is a classic off-road two-stroke motorcycle known for its reliability and trail-ready design. Like all liquid-cooled dirt bikes, regular coolant changes are vital to keep the engine running cool and to prevent internal corrosion, especially in vintage models like the IT250. Below is a step-by-step guide tailored specifically for owners of this unique machine.
Tools – Supplies Needed
- Socket set (for drain bolt and radiator cap removal)
- New coolant (engineered for motorcycles, safe for aluminum components)
- Drain pan
- Funnel
- Fresh sealing/crush washer (recommended)
- Distilled water (for flushing, do not use tap water)
- Gloves and eye protection
Preparation
- Ensure the IT250 is on a stable surface with the engine cool to avoid burns from hot coolant.
- Remove the seat and side panels as necessary for access to the radiator cap and reservoir.
Draining the Old Coolant
- Place the drain pan under the water pump area (typically the lower left side of the engine on the IT250).
- Remove the radiator cap to allow air into the system, which helps coolant flow out smoothly.
- Locate and remove the coolant drain bolt on the water pump. Allow all coolant to drain out completely.
- Pro tip: Replace the old crush washer on the drain bolt to reduce the chance of leaks during reassembly.
Flushing the Cooling System (Recommended for Aging Bikes)
- Reinstall the drain bolt securely.
- Add distilled water to the radiator, filling up to the neck.
- Start the engine and let it idle for 2-3 minutes to circulate water through the system, loosening any buildup.
- Turn off the engine, allow it to cool, then drain the flush water using the drain bolt.
- Repeat this process until the drained water runs clear (vintage dirt bikes often contain debris or old coolant residue).
Refilling with Fresh Coolant
- With the drain bolt tightened (using a fresh washer), slowly pour new motorcycle coolant into the radiator using a funnel until it reaches the base of the filler neck.
- Fill the overflow reservoir, if equipped, to the correct mark.
- Gently squeeze radiator hoses to help push out air bubbles. Allow the bike to sit a few minutes and recheck the coolant level, topping off if necessary.
Removing Air (Burping the System)
- Start the engine with the radiator cap off, allowing coolant to circulate and remaining air to escape.
- Blip the throttle a few times and gently rock the bike side to side, helping trapped air move to the top and out.
- Watch the coolant level – as air escapes, add more coolant as needed until it stays level at the filler neck.
- Once air is removed, install the radiator cap securely.
Final Inspection
- Start the engine again and let it reach full operating temperature. Shut it down and allow it to cool completely.
- After cooling, check both the radiator and reservoir levels. Add more coolant if necessary (minor topping off is common after the first ride as the system fully purges itself).
- Inspect for any leaks at the drain bolt and hoses.
Special Notes for 1982 Yamaha IT250 Owners
- The IT250 is known for its rugged simplicity, but old coolant can accelerate corrosion in the water jackets and the aluminum head. Regular coolant changes will significantly maximize the engine life.
- Many 1982 IT250s use simple, non-pressurized overflow systems – be sure to inspect old hoses for cracks or hardening, as replacements may be necessary on older bikes.
- Use only silicate-free coolant designed for motorcycles; automotive coolants can damage internal seals or react with the IT250s original aluminum components.
With these steps, your 1982 Yamaha IT250 will stay cool under pressure, allowing you to enjoy more miles on the trail with confidence.
Related Shopping Categories
Shop Radiators for a 1982 Yamaha IT250 Dirt Bike.
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Shop Radiator Hoses for a 1982 Yamaha IT250 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.