How to Change the Oil in a 2020 Honda CRF150R Big Wheel

Shop parts for a 2020 Honda CRF150R Big Wheel Dirt Bike.

Changing the oil in your 2020 Honda CRF150R Big Wheel is a vital part of dirt bike maintenance that ensures optimal performance and engine longevity. This model features separate engine and transmission oil compartments, making it slightly different from many other dirt bikes. Below you'll find a full breakdown of the tools you need, step-by-step instructions, and specific call-outs unique to this bike.

Tools and Materials Needed

  • 10mm and 12mm socket/wrench
  • Drain pan
  • Funnel
  • Rags or paper towels
  • Replacement oil filter (OEM or aftermarket as preferred)
  • New O-ring for the filter cover
  • Crush washers for drain bolts
  • Approved oil:– Honda GN4 10W-40 or equivalent (Engine: 590cc with filter; 560cc without filter | Transmission (clutch): 580cc)
  • Socket extension (optional but helpful)
  • Shop manual (recommended for torque specs)
  • Latex gloves (to keep your hands clean)

Preparation

  • Ensure the bike is on a stable stand and the engine is warm but not hot, which helps the oil drain quicker and more completely.
  • Wash the bike first to prevent debris from falling into the engine during the process.
  • Locate both the engine and transmission (clutch) side drain bolts. The CRF150R has two separate drain plugs and reservoirs for the engine and transmission/clutch oil — do not mix them.

Step-by-Step Oil Change

  1. Remove Drain Plugs and Drain Oil
    • Place your drain pan under the bike. Remove the engine side drain bolt (usually located on the left side, marked as “engine oil”). Allow the oil to drain completely.
    • Next, remove the clutch/transmission side drain bolt (typically on the right). Let this oil drain fully as well.
    • If the washers are damaged or worn, replace them with new crush washers for a proper seal.
  2. Remove and Replace the Oil Filter
    • The oil filter cover is secured with bolts—use your 10mm socket or wrench to remove them.
    • Take out the old filter and the O-ring from the cover. Clean the filter seat thoroughly.
    • Install the new oil filter, and replace the O-ring if necessary. Reinstall the filter cover, tightening the bolts to specification (consult your manual for the correct torque setting).
  3. Reinstall Drain Bolts
    • Once both sides have finished draining, clean the drain bolts and threads. Inspect or replace crush washers.
    • Screw in both drain bolts by hand, then tighten securely but do not over-tighten – stripped bolts are a common mistake.
  4. Add Fresh Oil
    • Using the funnel, refill the engine side with 590cc of oil if changing the filter (or 560cc if not).
    • Next, fill the clutch side with 580cc of oil. Both sides use the same 10W-40 oil.
  5. Check Oil Levels and Inspect for Leaks
    • Reinstall the fill and dipstick caps. Start the engine and let it run for 2-3 minutes to circulate the new oil.
    • Shut the engine down, let it sit for a few minutes, and recheck the oil levels, topping up if necessary.
    • Inspect around drain plugs and the filter cover for any signs of leaks.

Specific Model Call-Outs and Tips

  • Separate Compartments: The CRF150R Big Wheel uses two distinct oil reservoirs for the engine and the clutch/transmission. Always use separate drain pans or clean your pan between fluids to avoid cross-contamination.
  • Oil Quantities: Be meticulous with the amount of oil. Too much or too little can seriously affect engine or clutch performance. See above for exact cc/mL requirements.
  • Washer Replacement: Use fresh crush washers each change to prevent leaks and properly seal the drain bolts.
  • Recommended Oil: Use high-quality 10W-40 oil. Some riders use transmission-specific oil for the clutch side (80W or 85W), but 10W-40 is standard and recommended for most riding.
  • Warm Up and Recheck: Let the bike run post-change to circulate oil, then allow it to cool before checking and topping off.
  • Filter and O-Ring: Replace the O-ring on the filter cover; reuse only if it’s undamaged.
  • Torque Specs: Refer to the service manual for all torque specifications. Overtightening can strip threads in the lightweight aluminum cases.
  • Dispose Responsibly: Always dispose of old oil and filters at a certified recycling center.

Final Check and First Ride

  • After confirming that both fill caps are secure and cleaned up stray oil, take your CRF150R for a short, easy ride.
  • Afterward, double-check both oil levels again and inspect for drips around the drain and filter cover areas.

Follow this robust oil change protocol for your 2020 Honda CRF150R Big Wheel, and you’ll keep your bike running strong on the track or trail. For OEM or aftermarket oil change kits, filters, and top-rated oils, trust MotoSport.com for all your dirt bike maintenance needs.

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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.