How to Change the Oil in a 2025 Honda CRF150R Big Wheel

Shop parts for a 2025 Honda CRF150R Big Wheel Dirt Bike.

Maintaining your 2025 Honda CRF150R Big Wheel with regular oil changes is crucial to prolonging engine life and ensuring peak performance. This step-by-step guide from MotoSport.com covers all you need, including tools, quantities, specific model call-outs, and best practices for a professional-grade oil change.

Tools and Materials Needed

  • 10mm and 12mm socket or wrench (for drain and case bolts)
  • Drain pan (for capturing old oil)
  • Oil filter (if changing the filter)
  • Replacement crush washers (recommended for each drain bolt)
  • Measuring cup or graduated container
  • Clean funnel
  • Genuine Honda GN4 10W-40 oil or equivalent (see specs below)
  • Torque wrench (for accurate bolt reinstallation)
  • Shop towels (to clean up any spills)
  • Nitrile gloves (optional, for clean hands)

Oil Capacity and Specifications

  • Engine Side Capacity (oil and filter change): 590cc (0.59L)
  • Engine Side Capacity (oil only, no filter): 560cc (0.56L)
  • Clutch (transmission) Side: 580cc (0.58L)
  • Use 10W-40 motorcycle oil, Honda GN4 recommended
  • Replace oil filter with each scheduled change, per owner's manual

Step-by-Step Oil Change Procedure

  1. Warm Up the Engine
    • Start and idle the bike for 1–2 minutes. This warms the oil, allowing it to drain more completely.
    • Shut off the engine and let it cool for a minute or two.
  2. Set Up the Bike
    • Position the CRF150R upright on a stand or level surface.
    • Lay down shop towels and position the drain pan under the engine.
  3. Drain the Old Oil – Engine Side
    • Remove the engine oil fill cap/dipstick for venting.
    • Using a 12mm socket, carefully loosen and remove the engine side drain bolt.
    • Allow oil to fully drain. Inspect and replace the crush washer.
  4. Drain the Oil – Clutch/Transmission Side
    • Locate and remove the clutch side drain bolt (check manual/markings).
    • Drain transmission oil into the same pan. Replace the crush washer here as well.
  5. Remove and Replace Oil Filter
    • Remove oil filter cover bolts (10mm or Phillips, as appropriate).
    • Gently remove the old oil filter and O-ring.
    • Install new filter and lubricate the O-ring with fresh oil.
    • Reinstall cover and torque to spec as listed in the manual.
  6. Reinstall All Drain Bolts
    • Inspect bolts and washers. Replace crush washers as needed—reusing old washers can cause annoying leaks.
    • Tighten both drain bolts to specified torque (reference your service manual; typical torque is about 18–22 Nm). Avoid over-tightening to prevent thread damage.
  7. Add New Oil
    • Pour 590cc (with filter) or 560cc (without filter) of 10W-40 oil into the engine side using a funnel. Go slow to avoid spills.
    • Pour 580cc of the same oil into the clutch (transmission) side.
  8. Check Oil Level
    • Reinstall the dipstick/fill cap. Start the engine and let it run for several minutes.
    • Shut off and let the bike sit for a minute.
    • Remove the dipstick, wipe it clean, insert (but do not thread), then remove to check level. Top off if needed.
  9. Final Checks
    • Inspect for leaks around drain plugs, filter, and case seams.
    • Torque all bolts to spec one final time if needed.
    • Dispose of old oil and filter responsibly.

2025 Honda CRF150R Big Wheel Specific Call-Outs

  • Separate engine and transmission (clutch) oil circuits: Both must be drained and refilled.
  • Crush washers: Always use new ones on each drain bolt to ensure a perfect seal—old washers are a common cause of post-service leaks.
  • Oil quantities: Precise measurement prevents overfilling. The 2025 CRF150R Big Wheel closely follows previous years with 590cc engine, 580cc clutch side capacities, but always verify with your official service manual when in doubt.
  • Dipstick checking: Be sure to follow proper check procedure—insert (do not thread) when checking level after warming up the bike.
  • Filter orientation: Pay attention to orientation when installing new oil filter, matching the old filter's position. The wrong orientation can lead to engine damage.

Pro Tips

  • Warm (not hot) engines drain better and let more contaminants out.
  • Double-check that both drain bolts are tightened correctly before adding oil.
  • Keep thorough records of oil changes to maintain your bike's value and reliability.

With the right routine and attention to detail, changing the oil on your 2025 Honda CRF150R Big Wheel is straightforward. Use premium oil, always replace gaskets and washers, and don't skip the transmission side. Ride with confidence—MotoSport.com has your dirt bike parts, tools, and know-how 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.