How to Change the Coolant in a 2016 Yamaha YZ250: Step-by-Step Guide

Shop parts for a 2016 Yamaha YZ250 Dirt Bike.

Changing the coolant on your 2016 Yamaha YZ250 is a straightforward yet essential maintenance task that helps keep your engine running cool, especially during demanding rides. Here’s an expert guide from MotoSport on how to tackle the job and what every YZ250 owner should know about their specific bike model.

Tools – What You’ll Need

  • 10mm socket or wrench
  • Ratchet and extension
  • Catching pan
  • Fresh ethylene glycol-based coolant (preferred ratio: 50% coolant – 50% distilled or soft water)
  • Funnel
  • Gloves & eye protection
  • Rags for cleaning spills

2016 Yamaha YZ250 Coolant System – Owner’s Notes

  • The YZ250 features an aluminum engine, so always use a high-quality antifreeze with corrosion protection for aluminum.
  • Coolant capacity is about 1.2 liters (1.27 US qt).
  • Check hoses and the radiator cap for cracks or wear during this service interval.
  • Always let the engine cool completely before starting this process to avoid injury or burns.

Step 1: Prepare the Bike

  • Park your YZ250 on a level surface with the engine turned off and completely cool.
  • Prop the bike safely with a stand if available and remove the side panel for easier access to the radiator cap.

Step 2: Drain the Old Coolant

  • Place your catch pan directly under the engine, below the water pump.
  • Remove the radiator cap slowly to release any built-up pressure – avoid when engine is hot.
  • Locate and remove the coolant drain bolt (usually on the water pump cover) with your socket. A copper washer seals this bolt; save it for reinstallation.
  • Allow all coolant to drain completely from the system.

Step 3: Flush the Cooling System

  • Install the drain bolt and copper washer finger-tight.
  • Pour clean tap water into the radiator, replace the radiator cap, and briefly start the engine to circulate water for a few seconds (do not allow it to heat up).
  • Stop the engine and remove the drain bolt and radiator cap to flush out residual coolant and contaminants.
  • Repeat if needed until water runs clear.

Step 4: Reinstall Drain Bolt

  • After flushing, reinstall the drain bolt and copper washer, tightening to 10 Nm (1.0 m•kg, 7.2 ft•lb).

Step 5: Add New Coolant

  • Using a 50/50 mix of high-quality ethylene glycol anti-freeze and distilled or soft water, pour the coolant slowly into the radiator until full.
  • Gently rock the bike to release any trapped air and top off coolant as needed. The level should reach the top of the radiator neck.

Step 6: Check for Leaks – Final Steps

  • Reinstall the radiator cap securely.
  • Start the engine and let it idle for a few minutes. Watch the coolant level and check for leaks at the drain bolt, hoses, and radiator.
  • After the engine has cooled again, recheck the coolant level and top off if necessary.
  • Reinstall the side panel.

2016 YZ250 Peculiarities

  • This two-stroke model is well-known for aggressive track use—change coolant more frequently if riding hard or in extreme weather.
  • Replacement radiators and hoses are available if existing components show age or damage, which is common after crashes or tip-overs.
  • If switching from old coolant types to a new formula (i.e., water-based to non-water-based), always flush thoroughly to avoid chemical mixing issues.

Maintaining fresh coolant in your YZ250 ensures maximum cooling efficiency and protects your aluminum engine for seasons to come. For all the genuine replacement parts, radiator hoses, and high-performance coolant, MotoSport has you covered above.

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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.