How to Change the Oil in a 2021 Honda CRF250RX

Shop parts for a 2021 Honda CRF250RX Dirt Bike.

Changing the oil on your 2021 Honda CRF250RX is a crucial maintenance task to ensure the engine's longevity and performance. Below is a comprehensive guide proprietary to MotoSport.com, detailing the tools, steps, and special call-outs every owner needs for this specific make and model.

Tools and Supplies Needed

  • 8mm Allen key or socket (for oil drain plug)
  • 8mm socket or T-handle (for oil filter cover bolts)
  • Torque wrench (for correct tightening torque)
  • Oil drain pan
  • Clean rags or paper towels
  • New oil filter (suggested Honda part #15412-MEN-671)
  • New engine oil (Honda GN4 10W-40 or equivalent, about 1.0 quart/0.95L)
  • Measuring cup (for accurate oil refill)
  • Gloves and safety glasses

Step-by-Step Procedure

  1. Warm Up the Engine
    • Start the bike and let it idle for about one minute. Warm oil drains more completely and suspends contaminants better.
  2. Remove the Skid Plate
    • If your CRF250RX has a skid plate, remove the two 8mm bolts holding it in place to access the drain plug.
  3. Drain the Old Oil
    • Locate the oil drain plug on the bottom of the engine. Place the drain pan underneath.
    • Use an 8mm Allen key to remove the plug. Be careful—oil may be hot.
    • Allow the oil to drain completely. To help, tip the bike gently to the right and then back to the kickstand side to remove all leftover oil from the crankcase .
  4. Remove and Replace the Oil Filter
    • Find the oil filter cover (right side of the engine).
    • Remove the two 8mm bolts holding it in place. Take off the cover and remove the old oil filter.
    • Inspect the filter cavity and wipe away any remaining oil and debris with a clean rag.
    • Lubricate the new filter’s rubber gasket with a little engine oil. This ensures a good seal and eases installation .
    • Install the new filter (reference: K&N 116 or Honda 15412-MEN-671).
  5. Check Filter Spring & Orientation
    • Ensure the rubber gasket on the new filter faces outwards/gasket side faces the cover.
    • Retain or reinstall the filter’s spring if yours is separate; it must stay on the engine side.
  6. Reinstall Oil Filter Cover and Drain Plug
    • Place the cover back over the filter and loosely hand-thread the bolts.
    • Use the torque wrench to tighten them to manufacturer’s spec (typically 8.7 lb-ft, but check your service manual for exact spec).
    • Reinstall the drain plug with a new crush washer if available. Tighten to spec (18 lb-ft recommended; always verify).
  7. Add Fresh Oil
    • Remove the oil filler cap (right side of the engine).
    • Pour in the recommended oil type and quantity: Honda GN4 10W-40 or equivalent, 0.95L/1.0 quart .
    • Replace the filler cap.
  8. Check for Leaks and Oil Level
    • Start the engine and let it idle for about 30 seconds.
    • Shut off the engine and wait one or two minutes. Use the dipstick to check the oil level; add oil if needed.
    • Look under the bike and around the oil filter and drain plug for any signs of leaks.
  9. Reinstall Skid Plate
    • Reattach the skid plate using 8mm bolts.
  10. Dispose of Old Oil Properly
    • Pour the old oil into a sealed container and bring it to a local recycling center or auto parts store that handles used oil recycling.

Specific Call-Outs for the 2021 CRF250RX

  • Oil filter part number: Use Honda 15412-MEN-671 for correct fitment .
  • Oil quantity: The engine typically requires just under 1 quart. Overfilling can lead to increased crankcase pressure or oil leaks; always use the dipstick for final verification after warming up the bike.
  • Drain plug location: It is accessed from underneath the frame, so removing the OEM or aftermarket skid plate may be necessary .
  • Be careful with torque specs: The aluminum threads in the engine case strip easily. Always use a calibrated torque wrench.
  • Tipping the bike: To ensure a complete drain, lean the bike gently to the right then back to the left during draining .

Quick Oil Change Tips

  • Change oil every 8–15 hours of riding, or sooner for hard or muddy use.
  • Always use oil formulated for wet clutch motorcycle engines.
  • Inspect oil level before each ride to ensure proper lubrication.

Performing regular oil changes on your 2021 Honda CRF250RX is one of the most important maintenance tasks to keep you riding longer and help your engine deliver peak performance every time you hit the trail.

Related Shopping Categories

Shop Motor Oil for a 2021 Honda CRF250RX Dirt Bike.

Shop Oil Filters for a 2021 Honda CRF250RX Dirt Bike.

Shop Oil Drain Pans for a 2021 Honda CRF250RX Dirt Bike.

Shop Tools for a 2021 Honda CRF250RX Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2021 Honda CRF250RX Dirt Bike.

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.