How to Change the Oil in a 2009 Honda CRF150R Big Wheel

Shop parts for a 2009 Honda CRF150R Big Wheel Dirt Bike.

This comprehensive guide will walk you through a complete oil change for a 2009 Honda CRF150R Big Wheel. The CRF150R features separate engine and transmission oil compartments, each with its own drain plug and fill location. This how-to covers oil and oil filter changes for both sides, highlights necessary tools, provides specific model call-outs, and ensures you get the job done right for the best MotoSport.com experience.

Tools & Supplies Needed

  • Socket set (commonly 8mm, 10mm, or 12mm for drain bolts – confirm exact size for your specific bike)
  • Torque wrench
  • Drain pan
  • Rags/paper towels
  • Funnel
  • Replacement engine oil: Honda GN4 10W-40, 4-stroke motorcycle oil (or equivalent)
  • New oil filter
  • New O-ring for oil filter cover (recommended)
  • New crush washers for drain bolts
  • Gloves
  • Flathead screwdriver or small pick (for O-ring removal)

Model-Specific Notes & Call-Outs

  • Separate compartments: Your 2009 CRF150R has both engine and transmission oil compartments with individual drain and fill points. Both must be serviced independently.
    (This design is different from many other dirt bikes with shared oil systems.)
  • Drain Plug Sizes: Both compartments have their own drain plug. Take care not to confuse them. If unsure, consult your owner's manual or confirm with a Honda diagram.
  • Oil Capacities:
    • Engine Side: 590cc (when changing filter), 560cc (without filter change)
    • Transmission Side: 580cc
    Overfilling can damage your engine – measure carefully.
    Do not mix up engine and transmission oil fill points or quantities.
  • Recommended Oil: Standard Honda GN4 10W-40 works well for both sides, but some owners prefer dedicated transmission fluid (80W/85W transmission oil) for the clutch/transmission side.
    (Racing or harsh conditions may benefit from this practice.)

Step-by-Step Procedure

Preparation

  • Allow your engine to cool for safety, but changing oil when slightly warm helps old oil drain out more thoroughly.
  • Position your bike on a secure stand, keeping it vertical for accurate oil readings and easy access.
  • Gather all tools and required replacement parts.

1. Drain the Engine Oil

  • Place the drain pan under the engine oil drain bolt (typically on the right/lower side beneath the engine).
  • Loosen and remove the engine oil drain bolt. Let oil flow out completely.
  • Replace the crush washer on the drain bolt, if needed.
  • Reinstall and torque the drain bolt to specification (check your owner's manual for the exact torque – this is critical to avoid stripping threads).

2. Drain the Transmission Oil

  • Move the drain pan under the transmission side drain plug (typically on the left side, near the shift lever).
  • Remove the transmission oil drain bolt and allow oil to drain fully.
  • Replace the crush washer as above.
  • Reinstall and torque the drain bolt as specified.

3. Change the Oil Filter

  • Locate and remove the oil filter cover bolts (often on the right side).
  • Take off the cover and set aside the O-ring (replace if worn or damaged).
  • Remove the old filter, noting its orientation for reinstall.
  • Install the new filter the same way.
  • Lightly oil the new O-ring and fit onto the oil filter cover.
  • Reinstall the cover and torque bolts to spec. Do not overtighten.

4. Refill With Oil

  • Remove the engine oil fill cap (typically on the top/right side cover) and add 590cc if replacing filter, or 560cc if only changing oil.
    Use a measuring cup or graduated oil bottle for accuracy.
  • Replace the engine oil fill cap.
  • On the left side, remove the transmission oil fill cap and add 580cc of oil.
  • Replace the transmission fill cap.

5. Startup & Inspection

  • Start the bike and let it idle for a few minutes to circulate oil. Watch for leaks at all plugs and covers.
  • Shut it off, let it rest a couple minutes, then check the oil level (using the dipstick or site glass depending on your model side). Add oil if necessary to reach the correct level – do not overfill.
  • Double-check all bolts are snug and oil-tight.

Troubleshooting & Final Tips

  • Always dispose of old oil and the filter responsibly at a permitted recycling center.
  • Change oil more frequently if you race, ride in sand, or operate in severe conditions.
  • Keep a maintenance log – it's invaluable for resale and troubleshooting future bike issues.
  • Never use automotive (car) oil – always use motorcycle oil designed for wet clutches.

Following this guide will help ensure top performance, maximize the lifespan of your 2009 Honda CRF150R Big Wheel, and keep your riding season stress-free. For Honda OEM parts, oil change kits, and expert customer support, trust MotoSport.com as your go-to source.

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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.