How to Change the Oil in a 2020 Yamaha YZ450FX: The Complete MotoSport.com Guide
Shop parts for a 2020 Yamaha YZ450FX Dirt Bike.
Regular oil changes are critical to keeping your 2020 Yamaha YZ450FX running strong on the trail or track. Complete this essential maintenance task yourself by following this comprehensive MotoSport.com guide, specifically tailored for the 2020 Yamaha YZ450FX.
Tools and Supplies Needed
- Socket wrench (with 10mm and 12mm sockets)
- T-handle or regular ratchet
- Torque wrench
- Oil drain pan
- Measuring cup (capable of measuring at least 650 mL)
- Fresh engine oil (SAE 10W40, JASO MA2 certified, 650mL capacity for 2020 YZ450FX)
- New oil filter
- New crush washer or O-ring (as preferred; OEM recommended)
- Funnel
- Rags or paper towels for cleaning up spills
- Gloves and safety glasses (recommended for safety and cleanliness)
Step-by-Step Oil Change Instructions
-
Warm Up Your Engine
Briefly run the engine for 2-3 minutes to warm the oil. This allows the oil to drain more thoroughly. Make sure to perform this procedure in a well-ventilated area.
Tip: Never change oil when the engine and exhaust are hot to avoid burns. -
Set Up Your Work Area
Place your oil drain pan beneath the bike. If you have a skid plate, remove it to access the drain bolt easily.
Tools needed: Socket wrench, appropriate sockets. -
Remove the Oil Drain Bolt
Using a 12mm socket, carefully remove the drain bolt from beneath the engine, allowing old oil to fully drain into the pan.
Note: Be sure to also remove the crush washer. Replace it if worn or every oil change as a precaution, per OEM recommendations. -
Remove and Replace the Oil Filter
Locate the oil filter cover. Using a 10mm socket, remove the cover bolts and gently take off the old oil filter. Inspect and, if necessary, replace the filter cover O-ring.
Install a new oil filter, ensuring it is oriented correctly. Reinstall the cover and torque the bolts to the specifications in your service manual.
Call-Out (Specific to 2020 YZ450FX): Always use a high-quality oil filter. The exact type may vary (KN-140 or equivalent for common brands). -
Clean and Inspect the Oil Strainer
The YZ450FX includes an oil strainer (screen). It's good practice to remove and clean the oil strainer every several oil changes or if you notice excessive debris in your drained oil.
Reinstall the cleaned strainer securely before proceeding. -
Reinstall the Drain Bolt
With a new crush washer or O-ring, reinstall the oil drain bolt. Torque to manufacturer specification using a torque wrench for leak prevention.
Tools needed: Torque wrench. -
Add Fresh Oil
Pour 650mL (0.65L) of SAE 10W40 JASO MA2 certified oil into the engine via the oil fill port, using a funnel and a measuring cup for accuracy.
Do not overfill. Always use oil meeting or exceeding the manufacturer's recommendations to avoid warranty issues.
Product Tip: Ready-made oil change kits are available for this model and include the exact oil amount, filter, and washer for a stress-free change (like Motorex 311239 Kit). -
Check Oil Level & Run Engine
With the bike on level ground, reinstall the filler cap. Start the engine and let it idle for one minute. Shut off the engine, wait a minute, then check the oil level via the sight glass or dipstick, adding oil if needed.
Check for leaks at the drain bolt and filter cover. -
Final Check & Cleanup
Dispose of old oil and filter responsibly. Wipe up any spills and replace the skid plate if removed.
Inspect for leaks and confirm all bolts are properly torqued.
Your oil change is complete.
Special Notes for 2020 Yamaha YZ450FX Oil Change
- Oil Capacity: 650mL (0.65L) – overfilling can cause engine issues.
- Oil Specification: Use only 10W40 JASO MA2 certified oil for optimal clutch and engine performance.
- Filter Part Number: Most aftermarket filters labeled as “KN-140” will fit, but check your kit or dealer for precise applications.
- Crush Washer/O-Ring: Replacement is recommended with every oil change per Yamaha, though some riders reuse them until wear or leakage is visible.
- Service Interval: Yamaha recommends oil changes roughly every 7.5 hours of riding or after every third race for high-performance or off-road use.
Additional Pro Tips
- Always consult your Yamaha Owner’s Service Manual for torque specs and procedure references specific to your 2020 YZ450FX.
- Allow your bike to idle for a few minutes before draining—never rev a cold engine hard after an oil change.
- Keep a logbook for maintenance history—including date, oil type, hours, and filter brand—for resale value and troubleshooting.
With the right tools and supplies from MotoSport.com, you can keep your Yamaha YZ450FX running at its best and enjoy more time on the trail or track. Happy riding.
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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.