How to Change the Oil in a 2021 Husqvarna FS 450 — MotoSport.com Guide

Shop parts for a 2021 Husqvarna FS 450 Dirt Bike.

Changing the oil on your 2021 Husqvarna FS 450 is an essential maintenance task that ensures the engine remains healthy and operating at peak performance. This robust guide details everything you need to know, including required tools, a step-by-step procedure, and important call-outs specific to this model year. All guidance is proprietary to MotoSport.com.

Tools and Supplies Needed

  • Socket set and wrench (8mm, 10mm, 13mm recommended)
  • Torx bits (T30 and T45 as required by Husqvarna fasteners)
  • Oil drain pan
  • Oil filter (specific to 2021 FS 450)
  • Engine oil (Premium synthetic oil, 10W-50 or per manual specification)
  • Crush washer (replace for every oil change)
  • Oil screens/sieves (clean and inspect)
  • Measuring cup or graduated beaker
  • Funnel
  • Clean rags or paper towels
  • Contact cleaner (optional for cleaning surfaces)

Oil Change Interval

  • Change the oil every 6,000 km (approx. 4,000 miles) or as recommended by your usage patterns. For off-road/hard motocross use, opt for more frequent changes, ideally after every 15 hours of engine time for maximum protection .

Step-by-Step Guide to Changing the Oil

  1. Preparation
    • Warm up the Husqvarna FS 450 engine for a few minutes. This thins the oil, allowing it to drain more effectively.
    • Ensure the bike is on a stable, level stand.
    • Gather all tools and equipment. Remove any skid plate if present for unimpeded access to the drain bolts .
  2. Drain the Engine Oil
    • Locate the drain bolt on the underside of the engine. Place the oil drain pan beneath it.
    • Use the appropriate socket to carefully remove the drain bolt. Have a rag handy to catch the initial flow.
    • Let the oil drain fully; this can take several minutes. Tip the bike gently from side to side to help evacuate old oil.
    • Remove the oil filler cap to allow air in and increase drain speed .
  3. Remove and Inspect Oil Screens
    • The FS 450 uses two oil screens (sometimes referred to as oil sieves or strainers). Locate and unscrew them with the specified tool.
    • Remove both screens, noting their location for reinstallation. Clean screens thoroughly with contact cleaner and inspect for debris or damage.
    • Replace if excessively worn or damaged .
  4. Replace the Oil Filter
    • Locate the oil filter cover (typically secured by two bolts on the right crankcase cover).
    • Remove the cover and pull out the old filter. Check for excess metal or contaminants.
    • Prime the new oil filter with a small amount of fresh oil to ensure immediate lubrication at startup .
    • Insert the new filter, ensuring correct orientation. Replace the cover and torque bolts to specification (check service manual for precise value).
  5. Reinstall Cleaned Oil Screens and Drain Bolt
    • Insert both oil screens into their respective bores, ensuring correct alignment.
    • Install new crush washers on the drain bolt and screen bolts to prevent leaks.
    • Tighten all bolts to factory-specified torque values (typically 15 Nm; confirm in the owner’s manual for 2021 FS 450) .
  6. Add New Engine Oil
    • Place a clean funnel in the oil fill port.
    • Pour in 1,200 milliliters of recommended oil (double-check the owner's manual for your 2021 FS 450 to confirm this volume) .
    • Replace the oil fill cap securely.
  7. Final Checks and Top Off
    • Start the bike and let it idle for 3 minutes to circulate fresh oil.
    • Shut off and allow to sit 2–3 minutes. Check the sight glass; oil should register halfway to three-quarters up the window. Add more if required .
    • Inspect for leaks around the drain bolt and oil filter cover.
    • Reinstall skid plate if removed.
    • Dispose of old oil and filter responsibly.

Specific Call-Outs for 2021 Husqvarna FS 450

  • Always clean and inspect the two oil screens. Debris here could indicate clutch or engine wear.
  • Do not overtighten drain and filter cover bolts. Aluminum threads can strip easily; adhere closely to torque specs.
  • Prime the oil filter before installation for best results and immediate oil flow on startup .
  • Use only premium synthetic motorcycle oil rated for wet clutch systems. Do not substitute with automotive oil.
  • Check oil level before each ride, especially after the first few hours on fresh oil to ensure safe engine operation.

Frequently Asked Questions

  • Do I have to change the crush washers every time?
    Yes. Always install a new crush washer with every oil change for a proper seal and to prevent leaks.
  • Can I use different oil viscosity?
    Refer to your manual. 10W-50 is typical but riding conditions (hot/cold climate) may require different weights. Never stray from Husqvarna’s recommendations.
  • Do I need to clean the oil screens every time?
    Yes. Both screens protect your engine — be thorough in cleaning and checking these parts.

For the best results, use a complete oil change kit with filter, oil, washers, and any model-specific parts required. MotoSport.com carries all needed supplies for the 2021 Husqvarna FS 450 and offers expert advice for every service.

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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.