How to Change the Oil in a 2019 Honda CRF150R Big Wheel

Shop parts for a 2019 Honda CRF150R Big Wheel Dirt Bike.

This proprietary guide by MotoSport.com will walk you through a robust engine and transmission oil change on your 2019 Honda CRF150R Big Wheel. While this high-performance mini comes with separate compartments for engine and transmission oil, following the correct procedures is vital for longevity and optimal performance.

Tools & Supplies Needed

  • Metric socket set (8mm, 12mm, or as required for drain bolts)
  • Torque wrench
  • Drain pan
  • Funnel
  • Clean rags
  • New oil filter
  • Fresh Honda GN4 10W-40 oil (at least 1.5 liters or 2 quarts)
  • New crush washers for drain bolts
  • Phillips screwdriver (for oil filter cover)
  • (Optional) Rubber gloves

Oil Capacity – Specifications

  • Engine Side: 590cc (when changing oil and filter), 560cc (oil change only)
  • Clutch/Transmission Side: 580cc
  • Recommended Oil: SAE 10W-40 (Honda GN4 is standard)

Steps to Change the Oil

  1. Warm up the Bike: Start and idle the bike for 3–5 minutes. This helps oil flow out easier by thinning it.
  2. Stabilize Your Bike: Place the bike upright on a stand. For best draining, ensure it is level.
  3. Remove Skid Plate (if fitted): Some models have a skid plate. Remove it for easier access to drain bolts.
  4. Identify Drain Plugs:
    • The CRF150R has two separate drain bolts: one for the engine/crankcase (right side), one for transmission/clutch (left side).
  5. Drain the Engine Oil:
    • Place the drain pan under the engine-side drain bolt.
    • Remove the engine drain bolt and crush washer with the appropriate socket.
    • Let the oil drain completely.
  6. Drain the Transmission Oil:
    • Move the drain pan under the transmission-side drain bolt.
    • Remove the transmission drain bolt and let the oil fully drain out.
  7. Change the Oil Filter:
    • On the right engine case, remove the oil filter cover (usually secured with two bolts).
    • Carefully take out the old filter and any old O-rings or gaskets.
    • Wipe the area clean with a rag, then install a new filter and new O-ring.
    • Reattach the cover and tighten the bolts snugly (do not overtighten).
  8. Install New Crush Washers: Place new crush washers on each drain bolt for a proper seal.
  9. Reinstall Drain Bolts:
    • Screw each drain bolt back in by hand to avoid cross-threading, then torque to spec (consult manual or use approximately 12–18 ft-lbs).
    • Be extremely careful not to overtighten and strip the aluminum threads; use a torque wrench for accuracy.
  10. Fill Engine Side with Oil:
    • Remove the dipstick/fill plug on the engine side.
    • Pour in 590cc of 10W-40 oil (if changing filter) or 560cc (oil only).
  11. Fill Transmission Side with Oil:
    • Remove the transmission-side fill bolt/cap.
    • Pour in 580cc of 10W-40 oil (or transmission-specific oil if preferred).
  12. Reinstall Dipsticks/Fill Caps: Ensure both fill caps and dipsticks are clean, then reinstall firmly.
  13. Final Check:
    • Start the bike and let it run for a couple of minutes.
    • Stop the engine, let it sit 2–3 minutes for oil to settle.
    • Check oil level on both sides using the dipstick or sight glass, top up if necessary.
    • Inspect for leaks at drain bolts and oil filter cover.

Honda CRF150R Big Wheel Specific Call–Outs

  • Separate oil compartments: Unlike many bikes, this model requires two different drains and fills. Never use one oil for both systems unless specified.
  • Use correct oil amounts: Too much or too little can damage the engine or clutch. Always measure oil—do not rely on sight alone.
  • Replace crush washers every time: Essential for a proper seal and preventing leaks.
  • Oil filter orientation matters: Ensure correct fitment and that any O-rings are replaced and correctly seated to prevent pressure loss or leaks.
  • Prevent stripped drain bolts: Only tighten to spec; CRF150R crankcases are sensitive to over-torquing.
  • Use motorcycle-specific oil: Automotive oils may cause clutch slippage—stick with high-quality 10W-40 recommended by Honda.

Aftercare – Additional Tips

  • Check your maintenance interval and record your oil change.
  • Dispose of old oil and filters responsibly at a suitable recycling center.
  • If you notice milky oil, excessive debris, or metallic fragments, consult a professional.
  • For optimal performance, consider changing oil every 10–15 hours of ride time in race conditions, or 30 hours for trail riding, but always consult your owner’s manual for specifics.

Ride safe and keep your Honda CRF150R Big Wheel running strong with routine oil changes—brought to you by MotoSport.com.

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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.