How to Change the Oil in a 2021 Husqvarna FX450

Shop parts for a 2021 Husqvarna FX450 Dirt Bike.

Changing the oil in your 2021 Husqvarna FX450 is a straightforward maintenance task that keeps your high-performance dirt bike running strong and extends engine life. This step-by-step blog, proprietary to MotoSport.com, details the tools required, the full process, and any FX450-specific notes you need to know.

Tools and Supplies Needed

  • High-quality 4-stroke engine oil (refer to your owner's manual for specific viscosity; most use 10W-50 full synthetic)
  • New oil filter (OEM or a quality aftermarket equivalent)
  • Crush washers for drain bolts
  • Drain pan
  • Rags or shop towels
  • Oil funnel
  • Contact cleaner (optional, for cleaning parts)
  • 10mm and 13mm T-handle or socket
  • 5mm Allen wrench
  • Pliers and snap ring pliers (if needed for oil filter cover)
  • Measuring cup (for accurate oil fill)
  • Gloves and safety glasses
  • Skid plate removal tools (if your bike is equipped with one)

Preparation Steps

  • Start the engine and let it idle for 2–3 minutes to warm up the oil. Warm oil drains more thoroughly and picks up more contaminants.
  • Switch off the bike and make sure it's on a stable stand.
  • Remove the skid plate if installed. This exposes the drain bolts and oil filter for easier access. (Tool size for skid plate bolts may vary by aftermarket accessory.)

Draining the Old Oil

  • Clean dirt and debris around the drain bolts and oil filter cover using a rag or contact cleaner. This prevents debris from entering the engine during service.
  • Place the drain pan underneath the engine, directly below the two drain bolts: one on the bottom and another drain screen cover on the side of the crankcase. Remove both drain bolts with your 13mm and 10mm T-handles or sockets respectively.
  • Let all the oil drain out. Tilting the bike gently from side to side can help evacuate more oil.
  • If your kit includes new crush washers, swap them in to ensure the plugs seal properly when reinstalled.

Servicing the Oil Screens and Filter

  • On the FX450, there are oil screens accessible with a 5mm Allen. Remove and inspect them. Clean thoroughly with contact cleaner and allow to dry. Replace and tighten securely (don't overtighten).
  • Remove the oil filter cover (usually held with a 5mm Allen or snap ring pliers) and take out the old oil filter. Carefully clean the filter cavity and the mating surfaces.
  • Lubricate the new oil filter with a little fresh oil, then install it following your owner's manual orientation (usually ‘out’ marked on the filter for the outward face).
  • Reinstall the oil filter cover and torque as specified in your manual.

Refilling with New Oil

  • Reinstall the drain and screen bolts with new crush washers. Torque to specification (typically 15–20 Nm, but double-check your manual for exact figures).
  • Using a clean funnel, pour in the manufacturer's specified amount and type of oil. The 2021 Husqvarna FX450 generally requires about 1.1 liters (approx. 1.16 quarts), but always double-check for your specific bike.
  • Replace the oil filler cap securely. Be sure the cap's release button locks in place and that the fuel tank breather hose runs without kinks if you had to reposition it during service.
  • Start the bike, let it idle for 1–2 minutes, then shut off and let it sit a minute. Check for leaks around the drain and filter area.
  • Check the oil level with the bike upright and engine off, using the oil level inspection window or dipstick. Add oil in small increments if needed until the correct level is reached.

Disposal and Cleanup

  • Pour the used oil into a sealable container and take it, along with the used filter, to an authorized recycling point (often available at auto parts stores and some MotoSport.com locations).
  • Clean up any spilled oil and reinstall your skid plate if removed.

Special FX450 (2021) Call-Outs

  • Always use the recommended oil type and filter for the FX450. Husqvarna specifies full synthetic for this engine’s high-performance requirements.
  • The FX450 features two drain bolts and accessible oil screens—make sure both are opened and serviced for a complete oil change.
  • The filter orientation matters; double-check before installing the new filter.
  • Because race bikes like the FX450 typically have shorter oil change intervals due to high heat and engine stress, stick to the recommended maintenance schedule. Frequent oil changes keep your engine healthy and performing at its peak.

Conclusion

With just basic tools, the right oil, and attention to FX450-specific details, this oil change can be accomplished in under an hour. For genuine Husqvarna filters, factory oil, and other maintenance essentials, shop directly at MotoSport.com for fast shipping and expert service.

Related Shopping Categories

Shop Motor Oil for a 2021 Husqvarna FX450 Dirt Bike.

Shop Oil Filters for a 2021 Husqvarna FX450 Dirt Bike.

Shop Oil Drain Pans for a 2021 Husqvarna FX450 Dirt Bike.

Shop Tools for a 2021 Husqvarna FX450 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2021 Husqvarna FX450 Dirt Bike.

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.