How to Change the Coolant in a 2018 Husqvarna 701 Supermoto

Shop parts for a 2018 Husqvarna 701 Supermoto Dirt Bike.

Changing the coolant on your 2018 Husqvarna 701 Supermoto is a key part of routine maintenance that keeps your engine running at optimal temperature and protects internal components. The liquid-cooled single-cylinder engine in this model makes proper coolant care especially important for long-term reliability and maximum riding performance. Below is a detailed coolant change guide tailored for this specific modelfollow each step to help extend the life of your bike.

Tools & Supplies Needed

  • High-quality motorcycle coolant (consult your owner's manual for recommended type)
  • Drain pan
  • Socket set (10mm recommended)
  • Funnel
  • Clean rags
  • Protective gloves & eye protection

Step-by-Step Coolant Change Guide

  1. Preparation: Ensure the engine is completely cool to avoid burns. Place your bike on a stable stand and remove bodywork as needed for access to the coolant system and radiator cap.
  2. Locate the Coolant Drain Plug: On the 701 Supermoto, the coolant drain bolt is typically located on the lower right (throttle side) of the engine near the water pump. Having a drain pan under this area is essential to catch old coolant when it drains out.–2
  3. Release System Pressure: BEFORE removing the drain bolt, open the radiator cap to allow air to flow into the system, allowing coolant to drain more smoothly. Also open the reservoir/expansion tank cap.–2
  4. Drain Old Coolant: Use a 10mm socket to remove the coolant drain bolt. Let all coolant drain completely. For best results, gently rock the bike side-to-side to ensure all old coolant is expelled.
  5. Reinstall Drain Bolt: Ensure the drain bolt and sealing washer are clean. Reinstall the bolt, tightening securely but avoiding over-torque.
  6. Flush (Optional but Recommended): For a thorough service, flush the system with distilled water before adding new coolant. Fill, run briefly with engine off or at idle, and then repeat drain steps.
  7. Refill with New Coolant: Use a funnel to pour new coolant into the radiator up to the base of the filler neck. Fill the reservoir to the recommended level (typically midway between MIN and MAX marks).–3
  8. Remove Air Bubbles: Gently squeeze radiator hoses to help release trapped air. Start the engine with the radiator cap off and let it run until it cycles coolant (thermostat opens); watch for drop in level and top up as needed.–1
  9. Cycle and Cool Down: Once the fan cycles, turn off the bike and let it cool completely. Re-check coolant level in both radiator and reservoir. Add coolant if necessary.
  10. Final Checks: Reinstall all caps. Inspect for leaks, reinstall any bodywork, and wipe away spilled coolant.

Model-Specific Notes

  • The 701 Supermoto's cooling system is high-performance with a compact radiator and compensating tank. Correct coolant fill level is critical for preventing overheating.
  • This model uses a pressurized expansion tank that draws coolant back into the radiator as the system cools, so always double-check reservoir levels after a few ride/heat cycles.–1
  • Avoid using automotive coolants containing silicates or phosphates, which may damage the water pump seals over time. Always use manufacturer-approved motorcycle coolant.
  • Improper or low coolant level can trigger engine over-temp warnings or cause uneven running in extreme conditions.

Maintenance Reminder

Coolant breaks down over time and loses efficiency, so always replace according to the manufacturer schedule – or sooner if the fluid appears rusty, cloudy, or there are signs of leaks. Ensure all fasteners are tightened correctly and monitor coolant levels after each ride during the first week post-change.

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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.