How to Change the Oil in a 2011 Yamaha YZ450F: Step-by-Step Guide

Shop parts for a 2011 Yamaha YZ450F Dirt Bike.

Properly changing the oil in your 2011 Yamaha YZ450F is crucial for keeping your engine running smoothly and extending the bike’s lifespan. This guide is tailored specifically for the 2011 model and exclusively brings you MotoSport.com’s professional approach to dirt bike maintenance.

Tools and Supplies Needed

  • 8mm wrench or socket (for skid plate and oil filter cover bolts)
  • 12mm wrench or socket (for oil drain bolts)
  • Drain pan
  • Clean rags
  • Gloves (recommended)
  • 1 quart of 10W-40 oil (Yamaha-recommended)
  • Replacement oil filter (OEM part # 5D3-13440-09-00)
  • New crush washers (for drain bolts)
  • Funnel

Preparation and Safety

  • Work on a level surface and ensure your bike is secure on a stand.
  • Have all parts and tools ready before starting.
  • Start the bike and warm up the engine for 2-3 minutes to allow the oil to flow and suspend any contaminants, making drainage more effective.

Specific Call-Outs: 2011 Yamaha YZ450F

  • This model uses two oil drain bolts: one at the right rear of the motor, and one at the right front.
  • Be careful to remove and replace the crush washers on each drain plug to avoid leaks.
  • The oil filter can only be installed one way due to Yamaha’s design. Ensure the filter’s orientation matches the factory layout.
  • Always remove the skid plate first to access the drain bolts and filter cover.

Oil Change Procedure

  1. Remove the skid plate
    • Using an 8mm wrench or socket, remove the three bolts securing the skid plate and set it aside.
  2. Drain the old oil
    • Position a drain pan beneath the bike.
    • Remove both the rear and front oil drain bolts using the 12mm wrench. Allow the oil to drain completely.
    • Carefully remove and set aside the crush washers if you’re reusing them, but it is best practice to replace them with new washers each oil change.
  3. Remove and replace the oil filter
    • With an 8mm wrench or socket, remove the two bolts on the oil filter cover.
    • Be prepared for additional oil to drain when you remove the cover.
    • Remove the old oil filter. Inspect the filter cavity for debris, and clean the cover thoroughly.
    • Install the new oil filter, ensuring it is oriented correctly (it can only fit one way).
  4. Reinstall drain bolts and filter cover
    • Install new crush washers on the drain bolts.
    • Reinstall both drain bolts and torque to manufacturer’s specified setting (refer to your manual for exact torque).
    • Reinstall the oil filter cover and tighten the bolts securely (large bolt in the top, small bolt in the bottom on the cover).
  5. Refill with new oil
    • Remove the oil fill cap.
    • Using a funnel, pour in one quart of 10W-40 oil (Yamaha recommends this viscosity for the 2011 YZ450F).
    • Replace the fill cap.
  6. Check oil level
    • Start the bike and let it idle for several minutes, then turn it off and let it sit for a minute.
    • Check the oil level via the sight glass or dipstick (depending on your sub-model), and add oil if needed to reach the recommended level. Do not overfill.
  7. Reinstall the skid plate
    • Secure the skid plate with the 8mm bolts removed previously.
  8. Dispose of used oil and filter
    • Always dispose of used oil and filters at a qualified recycling center—never pour oil down drains or onto the ground.

Additional Pro Tips

  • Change oil often:– Yamaha recommends oil changes every 7.5 hours of running or every third race.
  • Keep new crush washers on hand to replace old ones every oil change to prevent leaks.
  • Inspect the drain plugs for any metal shavings, which can indicate engine wear.

With the right tools and this MotoSport.com guide, you’ll keep your 2011 Yamaha YZ450F running at its best for every ride.

Related Shopping Categories

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Shop Tools for a 2011 Yamaha YZ450F Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2011 Yamaha YZ450F 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.