How to Change the Coolant in a 1997 Yamaha XT350: Step-By-Step Guide

Shop parts for a 1997 Yamaha XT350 Dirt Bike.

The 1997 Yamaha XT350 is renowned for its reliable air-cooled four-stroke engine and straightforward design, making maintenance both crucial and accessible for long-term performance. Unlike many modern bikes, the XT350 relies on classic simplicity, but maintaining its cooling system ensures the engine delivers consistent power on and off-road. Here is MotoSport's proprietary guide for changing your XT350's coolant, including specific points unique to your dirt bike.

What Makes the 1997 XT350 Cooling System Unique?

The XT350 uses a cooling system centered around a steel coolant pipe and a cylinder-mounted water pump. The drain bolt—a 10mm-headed bolt with a washer—is located on the steel pipe running from the cylinder block to the pump. Keeping this system free of air and debris is especially important; overheating can quickly degrade engine performance in dual-sport environments.

Step 1: Preparation

  • Ensure the engine is completely cool before starting—hot coolant can cause severe burns.
  • Secure quality, pre-mixed motorcycle coolant (never use plain water or car-specific formulas).
  • Gather a drain pan, sockets, a funnel, and clean rags.

Step 2: Draining the Old Coolant

  • Locate the coolant drain bolt on the steel pipe connected to the cylinder block and water pump. This 10mm-headed bolt has a sealing washer beneath the head.
  • Place your drain pan beneath the bolt, remove the bolt, and allow all coolant to drain completely.
  • Inspect and, if necessary, replace the sealing washer to prevent leaks during reassembly.

Step 3: Optional System Flush

  • If your XT350's cooling system is dirty or it's been a long time since your last service, flush the system with distilled water.
  • Fill the system, run the engine briefly (do not let it overheat), then drain again.
  • Repeat until all traces of old coolant and debris are removed, then drain the system fully.

Step 4: Refilling with Fresh Coolant

  • Reinstall the drain bolt with its sealing washer, tightening securely but not excessively.
  • Pour fresh coolant slowly into the radiator or filler neck using a funnel. Fill gradually—pause if you hear gurgling to allow air to escape.
  • With the system nearly full, gently squeeze the coolant hoses and rock the XT350 side-to-side to help purge any trapped air.

Step 5: Burping the Cooling System

  • Locate the pump purge bolt on the pump assembly (also black-painted, 10mm head); slightly loosen this bolt to allow any trapped air to escape, then retighten once coolant seeps out.
  • Top off the coolant as needed.

Step 6: Final Checks

  • Run the engine with the radiator cap off for a minute, monitoring the coolant level closely. Finish filling if needed, then install the cap.
  • After reaching operating temperature, let the engine cool to ambient temperature. Recheck the level in the radiator and top off if necessary.
  • Inspect all connections for signs of leaks.

XT350 Owner's Tips & Notes

  • Check coolant levels regularly—low coolant is a leading cause of engine overheating.
  • Always use the correct blend of coolant and never mix types unless specified as compatible.
  • Due to its air-cooled cylinder head, the XT350 is especially sensitive to prolonged hard riding in hot conditions if coolant is low.
  • Replacing aged hoses and the drain bolt washer during service can prevent leaks down the road.

By following these proprietary MotoSport tips, your 1997 Yamaha XT350 will continue delivering reliable performance on any trail or highway adventure.

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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.