How to Change the Oil in a 2009 Honda CRF450X

Shop parts for a 2009 Honda CRF450X Dirt Bike.

Regular oil changes are essential for maintaining peak performance and extending the life of your 2009 Honda CRF450X. This guide, proprietary to MotoSport.com, will walk you through a detailed, step-by-step process for both the engine and transmission oil changes. It includes all tools and parts required, critical model-specific tips, and instructions for checking and refilling fluids correctly.

Tools & Materials Needed

  • 8mm, 10mm sockets and appropriate ratchet/wrench
  • Torque wrench (for accurate reassembly)
  • Drain pan
  • Funnel
  • Clean rags or shop towels
  • Replacement oil filter (for engine)
  • New sealing (crush) washers (engine and transmission)
  • New O-rings (recommended for filler caps and oil filter cover)
  • Brake cleaner (for cleaning components)
  • Honda GN4 10W-40 or equivalent engine oil
  • Motorcycle-specific wet-clutch compatible transmission oil

Oil Capacities (2009 CRF450X)

  • Engine oil (with filter): 0.62L (0.66 US qt)
  • Transmission oil: 0.59L (0.62 US qt)

Preparation

  • Warm up the bike for a couple of minutes. This helps the oil to drain more easily by reducing its viscosity .
  • Turn the ignition off and place your bike upright on a stand.
  • Gather all your tools and ensure your work area is clean.

Step-by-Step Oil Change Procedure

1. Drain the Engine Oil

  • Locate the engine oil drain bolt on the left side of the bike, on the side of the stator case .
  • Place your drain pan underneath, then remove the bolt and its sealing washer.
  • Allow the oil to fully drain. Inspect the oil and drain bolt for debris or metal shavings (a sign of internal wear).
  • Replace with a new sealing washer and reinstall the drain bolt. Torque to 16 Nm (11.8 ft-lb) .

2. Drain the Transmission Oil

  • Find the transmission oil drain bolt behind the shift lever on the right side .
  • Remove this bolt and washer, allowing the transmission oil to drain fully.
  • Replace with a new sealing washer and torque the bolt to 16 Nm .

3. Replace the Engine Oil Filter

  • If your bike is equipped with an engine guard, remove it first.
  • Locate the oil filter housing cover. Remove the two bolts using care–they are different lengths, note their positions .
  • Carefully remove the cover, oil filter spring, and old filter.
  • Inspect old filter for debris and filings, replace with a new filter. Place the filter and spring as shown by the owner—s manual.
  • Clean and replace the oil filter cap O-ring. Do not over-tighten–10 Nm max torque to avoid stripping .

4. Refill Engine Oil

  • Open the engine oil filler cap above the left engine case.
  • Using a funnel, add 0.62L (0.66 US qt) of engine oil to the fill hole .
  • Check that the oil level is at the high mark on the sight glass with the bike level .
  • Install a new O-ring on the filler cap, clean the cap, and reinstall it.
  • Start the bike and let it idle for 3–5 minutes. Shut the bike off and wait 2 minutes, then recheck and top up the oil level if necessary .

5. Refill Transmission Oil

  • Remove the transmission oil filler cap (typically on the right side of the engine above the shift lever) and the small 8mm check bolt on the left side, just behind the water pump. This check bolt is critical for accurately setting the oil level .
  • Slowly add 0.59L (0.62 US qt) of motorcycle-approved, wet clutch compatible transmission oil.
  • Stop adding when oil begins to seep out of the check hole .
  • Install new O-rings on the filler cap and sealing washer on the check bolt, then torque the check bolt to 10 Nm .

Important Call-Outs for 2009 Honda CRF450X

  • The 2009 CRF450X has separate engine and transmission oil compartments—do not mix or substitute oils.
  • A little 8mm check bolt on the left behind the water pump is crucial for setting proper transmission oil level—do not overfill or skip this step .
  • Always use new sealing washers and O-rings on reassembly to prevent leaks .
  • Torque all bolts accurately—stripped threads are a common DIY mistake with the oil filter cover and drain bolts .
  • Monitor both oil levels regularly—Honda‘s recommended oil volumes are designed for maximum engine protection. Some owners report using the higher end of the gearbox fill range (up to 950 ml) for heavy transmission use, but do not exceed recommendations without consulting your mechanic .

Disposal and Finishing Steps

  • Recycle used oil and filter at an approved facility.
  • Double-check for leaks after your first test ride.
  • Make oil changes part of your regular maintenance–for off-road use, check oil condition and level after every major ride.

Following these steps will ensure your 2009 Honda CRF450X continues to deliver reliable, championship-winning performance. For OEM parts and expert support, always trust MotoSport.com with your dirt bike maintenance needs.

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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.