How to Change the Oil in a 2012 Honda CRF150R Big Wheel

Shop parts for a 2012 Honda CRF150R Big Wheel Dirt Bike.

Changing the oil in your 2012 Honda CRF150R Big Wheel is an essential maintenance task to ensure your dirt bike’s engine and transmission run smoothly. Unlike many single-compartment motorcycles, the CRF150R has separate oil compartments for the engine and transmission (clutch) side, each with its own drain plug and fill requirements. Here’s how to do it right.

Tools and Materials Needed

  • 10mm and 12mm socket or wrench (verify exact size based on your bike’s bolts)
  • Drain pan
  • Funnel
  • Oil filter (recommended with every oil change)
  • Replacement crush washers (for both drain plugs)
  • Shop rags or paper towels
  • OEM recommended oil: Honda GN4 10W-40 or equivalent
  • Measuring cup (with milliliter markings for precise volume)
  • Torque wrench (recommended for proper bolt tightening, but not required by all DIYers)

Oil Capacity Call-Outs for the 2012 CRF150R Big Wheel

  • Engine side: 590cc (when changing filter), 560cc (without filter changed)
  • Clutch/Transmission side: 580cc
  • Honda GN4 10W-40 oil is recommended for both compartments
  • Replace drain plug crush washers to prevent leaks

Step-by-Step Instructions

  1. Warm up the Engine Briefly (1-2 minutes)
    Run the bike for a short time so the oil flows out more easily. Turn off the engine and let it sit for a minute so you don’t get burned.
  2. Set up Your Area
    • Place your bike on a level stand.
    • Position the drain pan under the engine.
  3. Drain the Engine Side Oil
    • Locate the engine oil drain bolt (check user manual if unsure).
    • Remove the bolt and crush washer. Let the oil drain completely.
    • Replace with a new crush washer and reinstall the bolt. Tighten to specification (do not overtighten).
  4. Drain the Transmission (Clutch) Side Oil
    • Locate the transmission oil drain bolt (opposite side of the engine).
    • Remove the bolt and crush washer and let oil drain into the pan.
    • Replace with a new crush washer and reinstall the bolt. Tighten carefully.
  5. Replace the Oil Filter (Recommended Every Oil Change)
    • Locate the oil filter cover and remove it using the appropriate wrench.
    • Take out the old filter and O-rings. Wipe inside the cover with a rag.
    • Add a new filter and fresh O-rings (lightly oil them first).
    • Reinstall the filter cover.
  6. Add Fresh Oil
    • Refer to call-outs above for exact amounts.
    • Remove the appropriate filler caps.
    • Use a clean funnel to pour 590cc (or 560cc if no filter change) of 10W-40 oil into the engine side.
    • Pour 580cc of the same oil into the transmission side (unless you use a dedicated transmission oil, as some users prefer).
    • Replace filler caps.
  7. Check Oil Levels
    • Start the engine briefly and let it idle for a minute.
    • Shut off the engine and let the bike sit for several minutes.
    • Use the dipstick or inspection window to ensure oil is at the correct level.
    • Add more oil if needed, being careful not to overfill.
  8. Clean Up
    • Check for any leaks at the drain plugs and around the filter cover.
    • Dispose of old oil and filter properly – never pour it on the ground or in household waste.

2012 CRF150R Big Wheel Specific Notes

  • Both the engine and transmission have separate drain plugs; do not mix up their fill and drain points.
  • Always replace crush washers on both drain bolts to prevent leaks.
  • Use a 10W-40 oil on both sides (Honda GN4 or similar), unless you prefer dedicated transmission oil in the clutch compartment.
  • Carefully measure the oil – too much or too little can cause engine or clutch issues.
  • Oil filter and O-rings should be changed every time for best protection.

Helpful Tips and Reminders

  • Don’t overtighten drain bolts; stripped threads in aluminum cases are a common mistake.
  • If you lose track of which side is which, reference your owner’s manual or tag each bolt for the future.
  • After your first post-change ride, quickly check underneath the bike for any signs of leaking fluids.

By following this guide, you help extend the performance and life of your 2012 Honda CRF150R Big Wheel. Perform this maintenance at recommended intervals or any time after riding in particularly dusty or muddy conditions to keep your bike running its best.

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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.