How to Change the Coolant in a 2021 Husqvarna 701 Supermoto

Shop parts for a 2021 Husqvarna 701 Supermoto Dirt Bike.

Regular coolant changes are key to safe & reliable performance on your 2021 Husqvarna 701 Supermoto. Coolant not only keeps the engine at the right temperature but also protects critical internal components from corrosion and overheating. Below you'll find a step-by-step, model-specific MotoSport guide for a complete coolant change–streamlined for the 701 Supermoto's unique chassis and radiator layout.

Before You Begin: What Makes the 701 Supermoto Special?

  • The 701's high-compression, single-cylinder engine runs hot, so proper cooling is crucial for performance & longevity.
  • The radiator is protected behind minimalist bodywork. Access is straightforward, but be careful not to overtighten fasteners when removing covers.
  • Coolant capacity is approximately 1.2 liters; always double-check with your manual for the most accurate specification.
  • Frequent stop-and-go, track days, or dirt riding can contaminate coolant faster–inspect more often under severe use.

Tools & Supplies Needed

  • Fresh coolant (make sure it is compatible with aluminum engines and meets manufacturer specs)
  • Ratchet with 10mm socket
  • Drain pan
  • Funnel
  • Rags or paper towels
  • Gloves and eye protection

Step-by-Step Coolant Change Process

  1. Ensure engine is completely cool. Hot coolant can cause burns.
  2. Position the bike upright on a stand or level surface. Remove the side covers as needed for easy access to the radiator and reservoir.
  3. Place a drain pan under the engine. Locate the coolant drain screw–usually on the lower right side of the engine case. The 701 uses a 10mm drain bolt near the water pump area.
    Tip: Open the radiator cap before removing the drain bolt to relieve vacuum and allow coolant to drain quickly.
  4. Remove the coolant drain bolt and let all fluid empty into your pan. Remove the reservoir cap if your model is equipped with a separate expansion tank.
  5. Inspect the old coolant for debris or oil. Any sign of contamination may require a cooling system flush or inspection for leaks.
  6. Reinstall and tighten the drain bolt to manufacturer torque specs (do not over-tighten; this is a small, delicate bolt).
  7. Using a funnel, slowly fill the radiator with fresh coolant until full. Also fill the overflow tank to the max line if equipped.
  8. Replace the radiator and reservoir caps. Briefly start the engine and let it idle with the bike upright–this will help purge trapped air from the system.
  9. Shut off the engine after 3–5 minutes. Allow it to cool, then recheck the coolant level and top off as needed.
  10. Inspect the drain bolt and visible hoses for any signs of leaks before reinstalling any bodywork.

Key Reminders for 701 Supermoto Owners

  • Regularly check coolant level, especially after long rides or in hot climates.
  • Always use gloves and eye protection–coolant is poisonous and can irritate skin and eyes.
  • If you frequently push your 701 hard–consider doing a coolant change more often than the manual intervals recommend.
  • If you spot unexplained coolant loss (especially under the starter area), promptly check for leaks.  Some 701s have reported leaks from gaskets or the water pump. Address any drips immediately to prevent overheating.

For factory-recommended coolant types, torque specs, or additional Husqvarna tips, always refer to your owner's manual or consult a MotoSport service professional.

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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.