How to Change the Coolant in a 2023 Husqvarna FC350

Shop parts for a 2023 Husqvarna FC350 Dirt Bike.

The 2023 Husqvarna FC350 sets a new benchmark for performance and reliability, but keeping your coolant fresh is crucial for maximum engine life and consistent performance – especially under race or trail conditions. Here is a proprietary MotoSport guide to changing the coolant on this standout motocross machine, with specific notes for FC350 owners.

What You Need

  • Coolant compatible with modern aluminum radiators (Engine Ice, blue G11, or OEM-equivalent; never mix types)
  • Basic hand tools (sockets, pliers, flathead screwdriver)
  • Drain pan
  • Funnel and clean rags
  • Distilled water (optional, for flushing)
  • Torque wrench (recommended for reassembly)
  • Protective gloves

Step 1 – Preparation

  • Ensure the engine is completely cool — hot coolant is dangerous.
  • Stand the bike upright on a level surface and remove the seat and front shrouds for better radiator access.

Step 2 – Remove the Radiator Cap

  • Slowly loosen the radiator cap to relieve pressure, then remove fully. This prevents any pressurized spray.

Step 3 – Drain the Old Coolant

  • Locate the coolant drain bolt on the engine case — typically at the lowest point of the water pump cover.
  • Position your drain pan beneath it.
  • Remove the drain bolt and allow all coolant to drain from both radiators. Open the radiator cap fully to speed the flow.
  • Optionally, tilt the bike gently or disconnect the lower radiator hoses to ensure complete draining.

Step 4 – Inspect & Flush (Optional)

  • If the coolant was dirty or if the system requires flushing, replace the drain bolt, fill with distilled water, run the engine briefly, then drain again to clear out residues.

Step 5 – Reinstall Drain Bolt

  • Check the drain bolt o-ring or washer, replace if worn.
  • Hand-tighten, then torque to manufacturer specification to avoid cracking the case.

Step 6 – Add New Coolant

  • Pour new coolant slowly into the radiator neck with a funnel. Use only the type rated for modern Husqvarna/KTM engines — blue G11 or a premium, silicate/phosphate-free coolant designed for aluminum (Engine Ice is popular).
  • Fill until the coolant reaches the bottom of the radiator neck.
  • Gently rock the bike to release trapped air.

Step 7 – Bleed Air from the System

  • Start the engine and let it reach operating temperature with the radiator cap off — watch for bubbles as trapped air escapes.
  • Some FC350s have a cylinder-head bleeder screw; open it briefly while filling to help purge stubborn air pockets, then retighten when coolant flows steadily.
  • Top off coolant as the level drops, then reinstall the radiator cap securely.

Step 8 – Final Checks

  • Clean up any spills and refit the plastics.
  • After one or two heat cycles, recheck the coolant level and top off as necessary.

2023 Husqvarna FC350 Model Notes

  • This model runs a high-performance, closed-circuit cooling system shared with KTM counterparts. Overheating is rare but possible if the coolant is low or old, so regular changes are vital.
  • Never mix coolant types (such as blue G11 and orange G12), as this can cause gelling and water pump or radiator deposit build-up.
  • If you ride in extremely hot, slow, or muddy conditions, consider a coolant recovery tank upgrade for overflow management.
  • OEM hose routing and sealing are tight: always inspect hoses and clamps after coolant service.

Proper cooling system care keeps your 2023 Husqvarna FC350 ready for the podium or the toughest trails. If in doubt, consult your MotoSport service experts or review your owner's manual for model-specific torque specifications and coolant recommendations.

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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.