How to Change the Oil in a 2006 Honda CRF250R

Shop parts for a 2006 Honda CRF250R Dirt Bike.

Regular oil changes are essential to maintain the performance and longevity of your 2006 Honda CRF250R. This step-by-step guide, proprietary to MotoSport.com, will show you how to change both the engine and transmission oil in your dirt bike. The 2006 CRF250R features separate chambers for engine and transmission oil, so both must be changed for complete service.

Tools and Supplies Needed

  • Socket wrench set (8mm, 10mm, 12mm sockets typical)
  • Oil drain pan
  • Funnel
  • New engine oil (consult your manual for the type and quantity; typically Honda GN4 10W-40 or equivalent)
  • New transmission oil
  • Replacement oil filter
  • Replacement crush washers (recommended for both drain bolts)
  • Shop towels or rags
  • Torque wrench (recommended for precise tightening)
  • Stand (optional, but makes draining easier)
  • Screwdrivers (if skid plate removal is needed)

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine
    • Start your bike and let it idle for a few minutes to warm the oil. Warm oil drains more thoroughly and suspends contaminants for better removal.
      Call-out for 2006 CRF250R: Warming up the engine is especially helpful as the Honda's unique twin chamber system benefits from full circulation before a change.
  2. Remove the Skid Plate
    • If you have a skid plate, use the appropriate socket or screwdriver to remove it for easier access to the drain bolts.
      This step may be skipped if your bike does not have a skid plate installed.
  3. Drain the Engine Oil
    • Place the oil pan underneath the engine drain bolt (under the right side of the bike, near the cylinder). Don't confuse this with the transmission drain bolt.
      Model Specific Tip: Some riders mistake the transmission drain plug (under the shift lever, left side) for the engine oil drain. Double check; the engine oil drain is on the right side of the crankcase.
    • Remove the engine oil fill cap (on the right engine cover) to help the oil flow out smoothly.
    • Loosen and remove the engine oil drain bolt and crush washer. Allow oil to fully drain.
    • Inspect the old oil – look for metal shavings or a burnt smell as indicators of other maintenance needs.
    • Remove the oil filter cover (right side cover, below the radiator hose; fastened by three bolts) and take out the old oil filter.
    • Clean oil filter cavity. Insert a new oil filter, ensuring it faces the correct direction as indicated in your manual.
    • Replace crush washer on the drain bolt and torque bolt to specification (consult your owner’s manual for torque specs).
  4. Drain the Transmission Oil
    • Move the drain pan under the transmission drain bolt (beneath the left engine case, under the shifter).
    • Remove the transmission fill cap (on top of the left case).
    • Remove the drain bolt and allow the transmission oil to completely drain.
    • Replace the crush washer and reinstall the drain bolt, torquing to specification.
  5. Refill with New Oil
    • For engine oil: Insert a funnel and add the recommended amount of fresh oil (typically about 0.7 quarts/650ml with filter change for the 2006 CRF250R, but always confirm in your manual). Replace the fill cap.
    • For transmission oil: On a level bike, remove the check bolt (overfill plug) on the left case (just above the transmission fill plug). Add oil until it begins to seep out of this check hole, then reinstall both bolts.
      Call-out for 2006 CRF250R: Don’t rely solely on the manual’s CC specifications; always double-check by using the overfill/check bolt method to ensure proper oil level.
  6. Check Levels and Inspect for Leaks
    • Start the bike and let it idle for a minute. Shut off and check both engine and transmission oil levels again, topping off if needed.
    • Visually inspect all drain and fill areas for any leaks.
    • Replace the skid plate if you removed it.
  7. Dispose of Old Oil Properly
    • Take used oil and the old filter to a recycling center. Never pour used oil down drains or into the environment.

Model-Specific Tips and Warnings

  • The 2006 Honda CRF250R uses separate chambers for engine and transmission oil. Make sure you change both; using the wrong fill location for the wrong fluid can cause severe engine or gearbox damage.
  • Use a new crush washer on all drain bolts to prevent leaks.
  • Honda specifies oil types and quantities in the owner’s manual. Never overfill; check levels using the check bolts for the most accurate reading.
  • If unsure which bolt corresponds to engine vs. transmission: Engine drain is on the right case, transmission on the left, roughly under the shifter.
  • Start with a cold engine for filter removal if you burned yourself in the past. But always warm up before draining oil for a complete change.
  • Over-tightening drain bolts can strip threads in the soft aluminum cases. Use a torque wrench and proper specs from the owner’s manual.

Final Thoughts

With a few basic tools and this guide, you can confidently maintain your 2006 Honda CRF250R’s oil system for continued peak performance and reliability. If you need genuine parts, filters, or quality oils, MotoSport.com has you covered.

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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.