How to Change the Oil in a 2024 Honda CRF450RX

Shop parts for a 2024 Honda CRF450RX Dirt Bike.

This guide details how to change the engine oil on your 2024 Honda CRF450RX dirt bike, with specific call-outs unique to this model. Accurate oil maintenance ensures longevity and performance under demanding riding conditions. This procedure is proprietary to MotoSport.com.

Tools and Supplies Needed

  • 8mm and 10mm sockets
  • 10mm Allen wrench
  • Ratchet
  • Torque wrench
  • Honda oil filter (confirm part number for CRF450RX 2024)
  • Honda 20W-50 or HP4 synthetic oil (refer to manual for exact quantity; generally 1.15L to 1.25L)
  • Replacement crush washer
  • Replacement O-ring (if required for oil filter cover)
  • Drain pan
  • Clean rags
  • Funnel (narrow or flexible recommended for small fill port)
  • Skid plate removal tool (if equipped)
  • Gloves

Preparation Steps

  • Warm up the engine for a few minutes to operating temperature. This helps suspend contaminants and allows the oil to drain more completely.
  • Park the bike on a level surface and shut off the engine.
  • Remove the skid plate (if installed) using the 10mm socket. Typically, there are three bolts: left, right, and bottom of the plate.

Step-by-Step Oil Change Instructions

  1. Remove Oil Filler Cap: Unscrew the oil filler cap, located on the left side of the engine, to allow crankcase ventilation and better draining. Keep it clean and set aside.
  2. Place Drain Pan and Remove Drain Bolt: Position your drain pan directly beneath the engine. Using the 10mm Allen wrench, carefully remove the drain bolt and crush washer from the lower rear of the crankcase. Let all the oil drain out fully.
  3. Replace Crush Washer and Reinstall Drain Bolt: After the oil has drained, inspect the crush washer for wear. Replace with a new crush washer to prevent leaks. Reinstall and tighten the drain bolt to the manufacturer’s specified torque (refer to the service manual; generally 18–22 Nm for Honda models).
  4. Remove the Oil Filter Cover: With the 8mm socket, remove the two bolts securing the oil filter cover on the left side of the engine. Gently pull off the cover; note the O-ring, which should be replaced if worn.
  5. Replace Oil Filter: Remove the old oil filter. Insert a new, clean oil filter in the same orientation (the open side facing out, toward you).
  6. Reinstall Oil Filter Cover: Refit the cover, ensuring the O-ring is properly seated and lubricated. Tighten the bolts evenly to 9 foot-pounds as specified for Honda engines.
  7. Refill with Fresh Oil: Using a small funnel, pour in the recommended quantity of Honda 20W-50 or HP4 synthetic oil without moly (the gold bottle is suitable for normal use; if you are hard on clutches, avoid this oil per user tips). The fill port is small, so steady pouring or funnel use is essential to avoid spillage.
  8. Double-Check Oil Level: With the bike upright on level ground, check the oil sight glass on the crankcase cover (just below the oil filter). Adjust the amount as needed to reach the “full” line. Replace and tighten the oil filler cap.
  9. Reinstall the Skid Plate: Secure the skid plate back onto the frame using the original hardware.
  10. Start and Inspect: Start the engine, let it run for a minute, and check for oil leaks around the drain bolt and filter. Recheck the oil level after the engine is off for a few minutes, and top off if necessary.

CRF450RX Model-Specific Call-Outs (2024)

  • Fill Port Size: The 2024 CRF450RX features a small oil fill port. Use a narrow funnel or pour with caution. Alternatively, oil can be added through the crankshaft position sensor plug for convenience; ensure this area is clean to avoid contamination.
  • Dipstick vs. Sight Glass: Unlike older 450X models, the RX uses a sight glass for oil level verification instead of a dipstick. Accuracy depends on the bike being level.
  • Oil Capacity: Always consult your owner’s manual to confirm the exact oil quantity (typically 1.15–1.25L for CRF450RX). Overfilling can lead to poor performance; underfilling risks engine damage.
  • Synthetic Oil Caution: HP4 synthetic oil (without moly) is recommended for most riders. If you are particularly hard on the clutch, consider a different oil formulation per expert user feedback.
  • Service Interval: Honda recommends changing the oil and filter every 15 hours of runtime or every six races to keep your motor protected.

Final Considerations

  • Always dispose of used oil and filters at an approved recycling center.
  • Keep records of your maintenance for warranty and longevity purposes.
  • Inspect other items (such as the air filter and chain) every oil change to maintain overall bike health.

Related Shopping Categories

Shop Motor Oil for a 2024 Honda CRF450RX Dirt Bike.

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Shop Tools for a 2024 Honda CRF450RX Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2024 Honda CRF450RX 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.