How to Change the Coolant in a 2021 Yamaha TTR110
Shop parts for a 2021 Yamaha TTR110 Dirt Bike.
Routine coolant maintenance is key to ensuring your 2021 Yamaha TTR110 runs reliably and safely across seasons. The TTR110, while small in displacement, is built for rugged dirt trails and younger riders – keeping the cooling system in top shape is critical for performance and engine longevity.
Why Change the Coolant?
Coolant breaks down over time and collects debris, reducing its ability to regulate engine temperature. Replacing old coolant prevents overheating, corrosion, and internal engine damage.
What You Need
- Fresh, model-appropriate engine coolant (Yamaha recommends a premixed ethylene glycol solution with corrosion inhibitors—never use pure water)
- Drain pan
- Ratchet and appropriately sized socket for the drain bolt (typically on the water pump side)
- Phillips screwdriver (for access panels if needed)
- Rags for spills
- Funnel
- Protective gloves and eyewear
Changing the Coolant: Step-by-Step Guide
- Allow the engine to cool. Never open the radiator cap or coolant reservoir when the engine is hot – hot coolant is highly pressurized and can cause severe burns.
- Access the cooling system. The TTR110's design offers straightforward access. Remove any side panels if they obstruct the radiator cap or hoses.
- Locate the coolant drain bolt. Find the drain bolt on the lower side of the engine cover, usually near or on the water pump. Position your drain pan underneath.
- Remove the radiator cap. This relieves vacuum pressure and allows coolant to drain more quickly.
- Loosen and remove the drain bolt. Carefully unthread the bolt, allowing coolant to flow out fully into the drain pan. Be patient; allow all fluid to escape.
- Inspect the drain bolt and gasket. Check the washer or gasket for signs of wear or damage. Replace if needed to prevent leaks.
- Reinstall the drain bolt. Tighten securely but do not overtighten – stripping the threads or damaging the housing is a common mistake. Use a torque wrench if possible.
- Refill with new coolant. Use a funnel to slowly pour fresh coolant into the radiator until full. Fill the expansion reservoir to the correct level as indicated.
- Bleed air from the system. Start the bike with the radiator cap removed, letting it idle for a few minutes. This helps air bubbles escape. Top up coolant if the level drops.
- Reinstall the radiator cap and panels. Secure all panels and check for leaks around the drain bolt and hose connections.
- Dispose of old coolant responsibly. Used coolant is hazardous – take it to a waste disposal facility.
2021 TTR110 Owner Tips & Model Notes
- The TTR110 does not feature a traditional radiator by design – it is air-cooled, not liquid-cooled. Routine maintenance for the TTR110 instead focuses on engine oil, air filter, and general inspection of components. If your model has been modified or you have a unique cooling setup, consult your owner's manual for details.
- Yamaha's recommendations for the TTR110 emphasize frequent checks of the air filter, throttle and cable lubrication, and oil changes due to dirt and dust exposure on trails.
- If you have any doubt about whether your TTR110 is liquid- or air-cooled, visually check for a radiator and coolant hoses. The stock 2021 TTR110 does not use coolant or need coolant changes, as it employs an air-cooling system.
For more model-specific parts and expert support, MotoSport provides everything needed to keep your TTR110 at peak performance, whether you're wrenching in the garage or hitting the track.
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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.