How to change the oil in a 2014 Honda CRF150R Big Wheel Dirt Bike

How to Change the Oil in a 2014 Honda CRF150R Big Wheel

Shop parts for a 2014 Honda CRF150R Big Wheel Dirt Bike.

Changing the oil in your 2014 Honda CRF150R Big Wheel is a crucial maintenance task that ensures optimal engine performance and longevity. The CRF150R features separate oil compartments for the engine and transmission, so it's important to service both. This comprehensive guide, customized for MotoSport.com readers, walks you through necessary tools, detailed steps, and expert call-outs specific to your dirt bike model.

Tools and Supplies Needed

• Metric socket set (8mm, 10mm, 12mm sockets)
• Ratchet or wrench
• Torque wrench
• Oil catch pan
• Funnel
• Clean rags
• New Honda oil filter (optional but recommended every second change)
• OEM replacement drain plug crush washers
• Honda GN4 10W-40 4-stroke oil (or approved equivalent) - at least 1.5 quarts
• Owner's manual (for torque specs and periodic maintenance)
• Gloves (optional for hand protection)

Model-Specific Oil Specs and Capacities

• Engine side oil capacity: 590cc (with oil filter change) or 560cc (without filter change)
  Make sure to use 10W-40 4-stroke motorcycle oil. Only fill to the spec–overfilling can cause performance issues.
• Transmission (clutch) side oil capacity: 580cc using 10W-40 4-stroke oil is recommended
  Some experts use 80W or 85W gear oil, but Honda specs 10W-40 on both sides for this model.

Step-by-Step Oil Change Instructions

• Warm Up the Engine
  Start your bike and let it run for about 3 minutes. This helps the oil drain more completely. Stop the engine and set the bike upright on a stand.
• Remove Skid Plate (if equipped)
  If your bike has a skid plate, remove it to access both engine and transmission drain plugs.
• Drain Engine Oil
  • Locate the engine oil drain bolt on the right side under the crankcase. Place your oil catch pan beneath it.
  • Use the correct socket to remove the bolt. Allow oil to fully drain. Replace the crush washer with a new one for proper sealing.
  • If changing the oil filter, remove the oil filter cover (typically a 8mm or 10mm socket). Pull out the old filter, inspect and clean the spring and filter cover, then install the new filter in the correct orientation according to your owner's manual.
• Drain Transmission Oil
  • Locate the transmission (clutch) drain bolt on the left side of the crankcase. Remove the bolt and let the oil drain into your pan. Replace the crush washer here as well.
• Reinstall Drain Bolts
  • Hand-tighten the bolts first, then use a torque wrench to tighten each bolt to manufacturer specification. Do not overtighten–stripping the threads is a costly mistake.
• Refill Oils
  • For the engine side, pour 590cc of 10W-40 oil through the filler cap using a funnel. Do not exceed this capacity–use the marks on your oil measuring cup, or a graduated container.
  • On the clutch/transmission side, add 580cc of 10W-40 oil.
• Check Oil Levels
  • After filling, reinstall the dipstick on the engine side and check the oil level. It should be between the upper and lower marks. Adjust if necessary.
  • If your bike uses a sight glass, check oil with the bike upright and level.
• Start Engine and Inspect for Leaks
  • Start the bike and let it idle for a couple of minutes. Shut off, allow it to sit for several minutes, then re-check oil levels and top off if necessary.
  • Inspect drain plugs, oil filter cover, and filler caps for leaks.
• Reinstall Skid Plate and Clean Any Spilled Oil.

Special Call-outs for 2014 CRF150R Big Wheel

• Separate Oil Compartments: Unlike many dirt bikes, the 2014 CRF150R has separate compartments and two drain bolts–do not mix up locations or fluids.
• Crush Washers are essential for both drain plugs. Replace each oil change to prevent leaks.
• Torque Spec: Always torque drain bolts to factory spec. Over-tightening can strip threads; under-tightening risks leaks.
• Oil Type: Use motorcycle-specific oil (JASO MA/MA2) for proper clutch performance. Automotive oils can cause clutch slipping.
• Filter Orientation: Double-check oil filter orientation–incorrect installation can block oil flow.

Disposal and Final Checks

• Dispose of used engine and transmission oil at a certified recycling facility–never pour down the drain or on the ground.
• Record your oil change in your bike's maintenance log or calendar for future reference.

Taking the time to change your oil regularly ensures your Honda CRF150R Big Wheel remains reliable and race-ready–trust MotoSport.com for your OEM and aftermarket parts needs. If you're unsure at any point, consult your owner's manual or trusted dirt bike technician.

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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.