How to Change the Oil in a 2007 Honda CRF150R Big Wheel

Shop parts for a 2007 Honda CRF150R Big Wheel Dirt Bike.

Regular oil changes are essential for the 2007 Honda CRF150R Big Wheel to ensure peak performance and long engine life. This bike features separate compartments for engine and transmission oil, and each requires its own attention during the oil change process. This guide, proprietary to MotoSport.com, provides a step-by-step method, lists all necessary tools, and points out important tips specific to the CRF150R Big Wheel.

Tools and Materials Needed

  • Socket wrench set (8mm, 10mm, 12mm sockets recommended)
  • Oil drain pan
  • Funnel
  • Shop towels or rags
  • Replacement engine oil filter
  • New O-ring for oil filter (optional but recommended)
  • Replacement crush washers (for drain plugs)
  • Honda GN4 10W-40 four-stroke engine oil or equivalent (at least 1.2 quarts total, refer to manual for specifics)
  • Transmission oil or use the same 10W-40 if preferred
  • Owner's manual (for specs and torque values)
  • Gloves (optional)

Preparation

  • Start the bike and let it warm up for 2-3 minutes. Warm oil drains more thoroughly and quickly.
  • Place the bike on a level surface and secure it with a stand.
  • Turn off the engine and allow it to cool briefly before starting the work.

Step 1: Drain the Engine Oil

  • Locate the engine oil drain bolt on the lower right side of the engine.
  • Place the oil drain pan underneath.
  • Use the appropriate socket to remove the drain bolt. Be careful not to strip the threads.
  • Allow the oil to drain completely.
  • Remove the engine oil dipstick to allow air in and promote faster draining.

Step 2: Replace the Engine Oil Filter

  • Locate the oil filter cover–typically secured with 8mm bolts.
  • Remove the cover and pull out the old oil filter.
  • Remove the O-ring and replace it if available.
  • Insert the new oil filter, install a new O-ring if needed, and reinstall the cover, tightening bolts evenly.

Step 3: Drain the Transmission/Clutch Oil

  • Locate the transmission/clutch oil drain bolt (separate from the engine side, situated on the left side under the shift lever).
  • Place the drain pan underneath and remove the bolt with the correct socket.
  • Allow all fluid to drain.
  • Replace the crush washer on the drain bolt, if available, before reinstalling.
  • Torque both drain bolts to factory specification using the manual for reference.

Step 4: Add New Oil

  • For the engine side, pour 590cc (about 0.62 US quarts) of Honda GN4 10W-40 oil through the filler cap. If you–re only changing the oil (not filter), use 560cc.
  • For the clutch/transmission side, add 580cc (about 0.61 US quarts) of the same oil or dedicated transmission oil as desired.
  • Use a funnel for a mess-free pour.
  • Reinstall both filler caps and wipe any excess oil.

Step 5: Final Check

  • Start the motorcycle and let it idle for 2-3 minutes.
  • Shut off and allow oil to settle for a few minutes.
  • Check oil levels using the dipsticks/filler plugs on each side; add oil if necessary to reach the correct level.
  • Inspect for leaks at all drain plugs and oil filter housing.

Model-Specific Call-Outs for the 2007 Honda CRF150R Big Wheel

  • The engine and clutch/transmission oils are separate—do not mix up the drain bolts or filler caps.
  • Always replace the crush washers on both drain bolts to prevent leaks.
  • The CRF150R–s small oil capacities make it crucial not to over- or under-fill; always measure accurately.
  • This model is known for easily stripped drain bolts due to the aluminum casing, so never over-torque them.
  • The manual recommends 10W-40 oil for both compartments, though dedicated transmission oil (80W or 85W) is sometimes preferred by riders for clutch longevity, especially in racing conditions.
  • If you misplace the owners manual, Honda–s official PDF is available online for reference.

Troubleshooting and Tips

  • Dispose of used oil and filters at a certified recycling location.
  • Inspect drained oil for metal shavings–a sign of possible engine wear.
  • If you encounter resistance when reinstalling bolts, stop and check the threads to avoid costly repairs.
  • Keep records of each oil change for maintenance scheduling.

By following these steps closely, your 2007 Honda CRF150R Big Wheel will keep running strong whether you–re racing or trail riding. Routine oil changes protect your engine and clutch, ensuring top MotoSport performance.

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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.