How to Change the Oil in a 2019 Yamaha YZ450FX

Shop parts for a 2019 Yamaha YZ450FX Dirt Bike.

  • Importance: Regular oil changes are crucial for maintaining your YZ450FX–s performance and longevity. Yamaha recommends changing the oil after the break-in period and then every third race or every 7.5 hours of riding. The procedure below is specifically tailored for the 2019 Yamaha YZ450FX, but also applies to 2018+ models.
    Always consult your official Yamaha Service Manual for torque specs and technical tips.

Tools and Supplies Needed

  • 10mm and 12mm sockets and ratchet
  • Flathead screwdriver
  • Torque wrench
  • Drain pan
  • Funnel
  • Clean shop rags or paper towels
  • Nitrile gloves and safety glasses
  • New oil filter (OEM or quality aftermarket)
  • New crush washer for the drain bolt
  • Engine oil: Yamalube 10W-40, or your trusted motocross-specific 10W-40 oil (check your owner's manual for capacity: approximately 1.0L with oil filter change)

Step-by-Step Instructions

  1. Preparation
    • Park your YZ450FX on a stable, level surface and ensure it is cool or only slightly warm.
    • If equipped, remove the skid plate with your sockets to access the drain plug.
    • Run the engine for 2-3 minutes to warm the oil (never hot), making oil drain more completely and easily

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    • Turn off the engine and ensure the bike is secure on a stand.
  2. Drain the Old Oil
    • Place your drain pan directly under the oil drain bolt, located at the bottom of the engine near the shift lever.
    • Remove the drain bolt with your 12mm socket. Take care to also remove the old crush washer (replace with a new one during reassembly)

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    • Allow oil to fully drain (several minutes). Tilt the bike gently (if safe to do so) to help the last of the oil escape.
  3. Replace the Oil Filter
    • Locate the oil filter cover on the right side of the engine (behind the brake pedal).
    • Remove the oil filter cover bolts using the 10mm socket. Carefully remove the cover and be aware of small O-rings or dowels, which you should inspect and replace if damaged.
    • Pull out the old oil filter and dispose of it responsibly. Wipe out the filter cavity with a clean rag.
    • Lubricate the rubber seal of your new filter with fresh oil and install it in the same orientation as the original—typically open side out.
    • Check and lightly oil the cover O-ring. Reinstall the cover and tighten bolts evenly to manufacturer-specified torque

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  4. Inspect and Clean the Oil Strainer
    • (Optional but recommended every few oil changes) On the YZ450FX, there is an internal oil strainer. Remove the access bolt as per your manual, withdraw and clean the strainer, reinstall with care

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  5. Reinstall the Drain Bolt
    • Install a new crush washer on the drain bolt, then thread the bolt in by hand to avoid cross-threading.
    • Tighten to the correct torque spec: 20 Nm (14.5 ft-lb) per your Yamaha manual.
  6. Add Fresh Oil
    • Remove the oil fill cap and insert a funnel. Slowly pour in fresh oil to the recommended capacity (usually about 1.0L if filter is also changed). Do not overfill.
    • Reinstall the oil fill cap securely.
  7. Final Checks
    • Start the engine and let it run for about 30 seconds while observing for leaks, especially around the drain bolt and filter housing.
    • Shut off the engine, wait a minute, then check the oil level using the sight glass or dipstick (as specified for the YZ450FX). Add more oil if needed until the level is correct.
    • Reinstall the skid plate if removed.
  8. Dispose of Old Oil and Filter Properly
    • Take used oil and filter to a certified recycling facility or MotoSport-approved disposal center

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Model-Specific Call-Outs for the 2019 Yamaha YZ450FX

  • Oil drain plug location: On 2019+ models, the plug is easily accessible from below, but be cautious of hot engine components

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  • Oil filter cover orientation: Double-check O-rings and do not overtighten bolts. Always follow torque specs from the Yamaha service manual.
  • Recommended oil: Use Yamalube or a high-quality 10W-40 four-stroke motocross oil for best clutch performance.
  • Crush washer: Always replace this to ensure a proper seal and prevent leaks.
  • Regular inspection: The YZ450FX–s high-performance engine oil requires frequent inspection—with more frequent changes under racing conditions

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Expert Tips for Your 2019 Yamaha YZ450FX

  • Keep a record of hours on your bike and oil change intervals using a simple log or smartphone app.
  • Use a magnetic drain plug to catch microscopic engine debris for added protection.
  • Hand-tighten bolts before torquing to avoid thread damage or stripping.
  • Never reuse old oil or filters—always install new supplies with each change for best engine protection.
  • For best results and more proprietary tips, shop all your synthetic oils, filters, and accessories at MotoSport.com—your dealer-approved source for dirt bike maintenance.

Ride Ready, MotoSport Style

  • Changing your own oil ensures your Yamaha YZ450FX is always ready to perform at its peak. A little time in the garage with MotoSport supplies goes a long way toward race-level reliability and fun on every ride.

Related Shopping Categories

Shop Motor Oil for a 2019 Yamaha YZ450FX Dirt Bike.

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Shop Oil Drain Pans for a 2019 Yamaha YZ450FX Dirt Bike.

Shop Tools for a 2019 Yamaha YZ450FX Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2019 Yamaha YZ450FX 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.