How to Change the Oil in a 2012 Honda CRF250R: A Step-by-Step Guide

Shop parts for a 2012 Honda CRF250R Dirt Bike.

Changing the oil in your 2012 Honda CRF250R is vital for peak engine performance and longevity. This guide, proprietary to MotoSport.com, provides everything you need to efficiently and effectively perform an oil change on your dirt bike, with specific call-outs for your year, make, and model.

Tools & Supplies Needed

  • Engine oil (Refer to your owner's manual for the correct type and quantity. For most CRF250R models 2004-2012, approximately 650cc for the engine side and 750cc for the transmission side is standard, but always verify for your specific bike.)
  • New oil filter (OEM or high-quality aftermarket compatible with 2012 CRF250R)
  • 12mm socket or wrench (for oil drain bolts)
  • 8mm socket or wrench (for oil filter cover bolts)
  • Drain pan
  • Clean rags or shop towels
  • Funnel
  • Torque wrench (optional but recommended for precise reinstallation)
  • Rubber gloves (optional, for cleanliness)

Preparation

  • Start and run your CRF250R for about 3 minutes. This warms the oil, helping it drain out smoothly along with any contaminants.
  • Shut down the engine and let it sit for 2-3 minutes to settle oil in the sump and cool slightly for handling.
  • Place the bike upright on a level surface or use a bike stand for stability.

Step 1: Remove the Skid Plate (if equipped)

  • Use a 10mm socket or wrench to remove the skid plate, if installed, to access the drain bolts underneath the engine(3).

Step 2: Drain the Engine Oil

  • Locate the engine oil drain bolt (12mm) under the right side of the engine.
  • Position your drain pan beneath the bolt.
  • Use a 12mm socket/wrench to remove the bolt and let oil completely drain out.
  • While draining, inspect the oil for metal shavings that could indicate excessive engine wear.
  • Remove the oil fill cap/dipstick on the right side (above engine case) to allow air in and promote faster draining(4).

Step 3: Drain the Transmission Oil

  • The 2012 CRF250R uses separate oil for the engine and transmission. Locate the transmission oil drain bolt (also 12mm) near the left side, behind the shifter.
  • Remove the bolt and drain the transmission oil into the same or a separate pan(2).
  • Remove the transmission oil fill bolt located on the left engine cover to assist draining.

Step 4: Replace or Clean the Oil Filter

  • Remove the three 8mm bolts securing the oil filter cover on the right side of the crankcase.
  • Take out the cover and the oil filter. Inspect the old oil filter for metal debris.
  • Install the new oil filter with the open end facing out.
  • Check and, if necessary, replace the O-ring on the oil filter cover. Lightly oil the new O-ring for a proper seal.
  • Reinstall the oil filter cover and torque the bolts to manufacturer specifications.

Step 5: Reinstall Drain Bolts

  • Clean and reinstall the engine and transmission oil drain bolts. Always use new drain bolt washers if available for leak-free sealing.
  • Torque the bolts to manufacturer specifications (refer to your service manual if needed).

Step 6: Add New Oil

  • Engine Side: Fill with the specified amount of oil (generally around 650cc, but check your manual). Fill until oil just begins to seep from the check bolt hole, not exceeding the maximum to avoid overfilling(1).
  • Transmission Side: Fill with the specified amount of transmission oil. Reinstall the fill cap.
  • Use a funnel to avoid spills. Always fill both compartments separately (engine and transmission).

Step 7: Final Checks and Oil Level Verification

  • Reinstall both fill caps securely.
  • Start your CRF250R and let it idle for 2-3 minutes. Shut it off and let oil settle again.
  • Check both engine and transmission oil levels using the dipstick and check bolts.
  • Add oil if needed to bring level between the upper and lower marks – do not overfill(4).
  • Inspect for oil leaks around drain bolts, filter cover, and filler caps.
  • Reinstall skid plate, if equipped.

Specific 2012 Honda CRF250R Call-Outs

  • This model uses separate engine and transmission oil.
  • Always check oil levels after running the bike and topping off as needed: After the initial oil change and startup, levels may drop as oil circulates throughout the engine and clutch cases(1).
  • Use caution not to overtighten drain bolts or filter cover bolts; the engine case is aluminum and can be damaged if overtightened.
  • Be aware of oil quantity: The owner's manual may specify CCs, but always fill only until oil starts to seep from the check bolt (for precision), rather than relying solely on a measuring cup(1).
  • Choose oil rated for high-revving motocross engines for maximum longevity and protection. High-quality synthetic oil is recommended.

Disposal

  • Dispose of used oil and filters at an approved recycling facility. Never pour oil onto the ground or into household drains.

Conclusion

  • Changing the oil regularly—about every 5-10 hours of ride time in racing conditions—is essential for keeping your 2012 Honda CRF250R in prime racing shape. With the right tools and steps, your engine and transmission will deliver reliable performance season after season.

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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.