How to Change the Oil in a 2007 Honda CR125 – MotoSport.com Guide

Shop parts for a 2007 Honda CR125 Dirt Bike.

Changing the oil in your 2007 Honda CR125 is a regular maintenance task essential for keeping your bike performing at its best and extending the life of its internal components. While this process is straightforward, being attentive to model-specific details and performing each step carefully ensures optimal results.

Tools and Supplies Needed

  • 17 mm socket wrench
  • Oil drain pan
  • Funnel
  • Rags or shop towels
  • Replacement transmission oil (consult your owner's manual for recommended type and volume)
  • New sealing washer (optional, but recommended if damaged or crushed)
  • Measuring cup (to ensure accurate oil fill)
  • Gloves (optional, but helps keep your hands clean)

Steps to Change the Oil on a 2007 Honda CR125

  1. Preparation
    • Start your bike and let it idle for 1-2 minutes to warm the oil. This thins the oil and lets more contaminants drain out efficiently.
      Tip: Don’t over-rev; simply let it idle.
    • Shift the transmission into neutral and switch off the engine completely.
    • Position your bike upright on a stand for stability and access.
    • Gather all tools and place the oil drain pan under the engine’s drain bolt.
  2. Drain the Old Oil
    • Locate the oil drain bolt under the right side of the crankcase. On your 2007 CR125, this is a 17 mm bolt beneath the engine.
      All CR125 models use similar locations for the drain and fill points.
    • Use the 17 mm socket wrench to loosen and remove the drain bolt. Allow all oil to drain completely into your pan.
      The oil may appear grayish due to clutch fiber material, which is normal for 2-stroke transmission oil.
    • Carefully inspect the sealing washer on the drain bolt. If it’s damaged or overly compressed, replace it with a new one before reinstalling.
  3. Reinstall the Drain Bolt
    • Clean the drain bolt and the area around it with a rag.
    • Reinstall the drain bolt (and new washer, if used). Tighten it snugly, but avoid over-tightening to prevent stripping the threads.
  4. Refill with Fresh Oil
    • Locate the oil fill cap on the right engine case (above the clutch cover).
    • Remove the fill cap and insert a funnel.
    • Consult your owner’s manual for the exact oil capacity (typically around 650cc/0.65L for the 2007 CR125, but verify your manual).
    • Pour in new, manufacturer-recommended transmission oil. Do not overfill; precise measurement is important for clutch performance and reliability.
    • Replace and secure the fill cap.
  5. Check Oil Level
    • The 2007 CR125 features a oil check bolt (inspection bolt) on the right side case. Remove this bolt; oil should just begin to trickle out when the bike is upright and filled to the correct level.
    • If nothing comes out, add oil a little at a time until it does. If too much flows out, allow it to drain to the proper level before installing the inspection bolt.
    • Reinstall and torque the oil check bolt appropriately.
  6. Cleanup – Final Inspection
    • Wipe up any oil spills with rags. Dispose of the old oil according to your local regulations.
    • Start the bike and let it idle for a minute. Check for leaks around the drain and check bolts.
    • Turn the bike off and re-inspect oil levels, topping up if necessary.

Owner-Specific Notes for the 2007 Honda CR125

  • The drain bolt, oil fill cap, and oil check bolt locations are virtually identical across all CR125 models from the late 1990s through 2007.
  • Always warm the engine gently; aggressive revving with thick, cold oil can risk engine wear or even cold seizures on a 2-stroke.
  • Check your manual for the manufacturer’s recommended type and capacity. The 2007 Honda CR125 typically needs 0.65L (650cc) of oil, but confirm based on your riding conditions.
  • Never reuse old oil and always dispose of used oil responsibly.
  • Inspect the drained oil for metal flakes. Small amounts of clutch fiber are normal, but excessive metallic content can indicate component wear and may warrant further investigation.

Professional Tips

  • If you’re riding in extreme conditions (motocross, sand, or mud), more frequent oil changes may be necessary to maintain performance.
  • Using a measuring cup designed for motorcycle oils ensures accuracy, helping prevent both underfilling and overfilling.
  • Keep a record of each oil change and any notes about oil condition for easier future maintenance tracking.
  • Consider replacing the oil check and drain bolt washers every few changes for best sealing.

Conclusion

Performing regular oil changes on your 2007 Honda CR125 is essential for long engine and clutch life. With the correct tools, precise oil measurement, and by following the process above, you’ll keep your bike running strong whether you’re hitting the track or trail. For all your parts and oils, trust MotoSport.com for quality and fast shipping.

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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.