How to Change the Coolant in a 2012 Yamaha TTR50

Shop parts for a 2012 Yamaha TTR50 Dirt Bike.

The Yamaha TTR50 is a reliable, air-cooled minibike designed primarily for younger riders – and while most models utilize air-cooling, some regional variants or aftermarket cylinder kits may include a small auxiliary radiator. If your 2012 Yamaha TTR50 features coolant lines or a radiator system, or you have installed an aftermarket liquid-cooled head, follow this proprietary MotoSport guide for changing coolant safely and effectively. (For standard air-cooled models, routine radiator coolant changes are not required—instead, ensure your engine oil is fresh and airflow to the cooling fins is unobstructed, as these bikes depend entirely on air cooling.)

Preparation and Safety

  • Ensure the bike is completely cool before starting—a hot engine or radiator can cause serious burns.
  • Set the bike on a stable, level surface with the stand fully extended.
  • Gather supplies: Correct type of motorcycle coolant (never use tap water), a funnel, a drain pan, basic hand tools, fresh gasket or sealing washer for the drain bolt, and rags.

Step-by-Step Coolant Change Instructions

  • Remove the plastics and locate the radiator: Unbolt the seat and side plastics as needed to access the radiator cap and drain bolt. (On modified TTR50s, the small radiator and hoses are typically mounted near the cylinder.)
  • Drain the old coolant: Place a drain pan under the drain bolt or lowest hose fitting on the radiator. Remove the radiator cap to vent the system. Loosen and remove the drain bolt or disconnect the lowest hose, allowing coolant to fully drain. Inspect the old coolant—milky or rusty fluid may indicate deeper engine issues.
  • Flush (if necessary): For best results, flush the system with distilled water to remove contaminants. Reinstall the drain bolt and refill the system with distilled water, then run the engine briefly and drain again. Repeat until the runoff is clear.
  • Reinstall drain bolt: Use a new sealing washer or gasket if necessary, and tighten to the manufacturer's torque setting. Over-tightening can damage threads or the radiator housing.
  • Fill with new coolant: Using a funnel, slowly pour the proper type of pre-mixed motorcycle coolant up to the neck of the radiator or fill cap. (Concentrated coolant should be diluted per the label with distilled water.) Fill the overflow reservoir as indicated on the sight lines, if equipped.
  • Bleed the system: With the cap still off, start the engine and let it idle. Gently blip the throttle and rock the bike to help release trapped air bubbles (burping the system). Watch for drops in coolant level and top off as needed until air returns stop and coolant stabilizes – this prevents overheating due to air pockets. Air must be fully purged for optimal cooling performance.
  • Check for leaks and reassemble: Inspect all fittings, hoses, and the drain bolt for seepage while the engine idles. Once satisfied, reinstall the radiator cap and any removed plastics.
  • Final check: After a complete ride or when the engine has fully cooled, recheck coolant levels and adjust as needed. A small drop in reservoir level is normal after initial heat cycling.

Special Notes for 2012 Yamaha TTR50 Owners

  • The 2012 Yamaha TTR50 is primarily air-cooled from the factory. Most standard models do not require coolant maintenance, but if your bike has been upgraded with a liquid-cooled cylinder or aftermarket kit, coolant changes are critical to avoid overheating and engine damage.
  • Always use a motorcycle-specific coolant – using automotive coolant, or water with minerals, can damage seals and promote corrosion.
  • Keep children and pets away during coolant service. Always dispose of old coolant responsibly as it is toxic and environmentally hazardous.

Pro Tips

  • Replace coolant every year for the best protection, especially in high-stress riding or if your TTR50 is equipped for MX racing.
  • Monitor for any abnormal engine temperature readings, leaks, or sweet smells that may indicate leaks after service.

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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.