How to Change the Oil in a 2018 Honda CRF50F

Shop parts for a 2018 Honda CRF50F Dirt Bike.

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Tools & Supplies Needed

  • 10mm or 17mm socket wrench (check your drain bolt size)
  • Oil drain pan
  • New sealing washer (for the drain bolt)
  • Funnel
  • Recommended engine oil (see below for specification)
  • Cleaning rags
  • Torque wrench (recommended for proper bolt tightness)
  • Safety gloves
  • Container for used oil (for environmentally safe disposal)

Recommended Oil Type & Amount

  • Type: 4-stroke engine oil, per Honda spec (consult owner’s manual for viscosity based on your climate; 10W-30 is typically recommended)
  • Amount: 0.6 US qt (approx. 600 ml)

CRF50F Model Call-Outs

  • No oil filter element to replace. Simply drain and refill with fresh oil.
  • Do NOT remove the cam chain tensioner push rod bolt (next to the drain bolt). Accidental removal can cause engine issues and require adjustment at a Honda dealer.
  • Check the sealing washer on the drain bolt each time; replace to avoid leaks.
  • The oil fill cap also serves as the dipstick. Do not thread it in when checking oil level – just rest it on the opening with the bike upright.

Step-By-Step Instructions

  1. Warm Up the Engine
    • Start the CRF50F and let it idle for 3-5 minutes.
    • This ensures the oil thins and drains thoroughly.
  2. Park the Bike Safely
    • Turn off the engine.
    • Place the motorcycle on a firm, level surface, keeping it upright (not on side stand).
    • Let the bike sit for 2-3 minutes, allowing oil to settle.
  3. Remove Oil Fill Cap/Dipstick
    • Unscrew and remove the oil fill cap/dipstick on the right side of the engine. Set aside.
  4. Drain the Old Oil
    • Position the oil drain pan beneath the drain bolt, located on the lower right side of the engine.
    • Using a socket wrench, loosen and remove the oil drain bolt (not the cam chain tensioner push rod bolt).
    • Allow the oil to completely drain. For a thorough drain, tilt the bike gently side-to-side after the initial flow slows down.
    • If needed, use a rag to clean up any oil spills.
  5. Inspect and Replace Sealing Washer
    • Remove the old sealing washer from the drain bolt.
    • Replace with a new washer to prevent future leaks (affordable and highly recommended).
  6. Reinstall the Drain Bolt
    • Hand-tighten the drain bolt, then torque to 18 lbf·ft (24 Nm) using a torque wrench for best results.
  7. Add New Engine Oil
    • Insert a funnel into the oil fill port.
    • Pour in approximately 0.6 US quarts (600 ml) of oil. If the engine was not perfectly drained, you may need slightly less or more — fill to the mark, not by volume alone.
    • Reinstall the oil fill cap/dipstick securely.
  8. Run the Engine and Check Levels
    • Start the engine and let it idle for 3-5 minutes.
    • Turn it off and let it sit 2-3 minutes for oil to settle.
    • With the bike held upright and level, remove the fill cap/dipstick, wipe it clean, insert (do NOT screw in), then check the oil level. Add oil if it is below the upper mark, but avoid overfilling.
  9. Final Checks
    • Ensure there are no leaks around the drain bolt or fill cap.
    • Clean up any spilled oil, dispose of used oil at a certified recycling center, and record the maintenance in your service log.

Owner Tips for the 2018 CRF50F

  • Perform oil changes at shorter intervals in dusty or extreme conditions.
  • Avoid overtightening the drain bolt, as the small case threads can strip easily — always use a torque wrench if available.
  • Use only oil formulated for wet-clutch motorcycle engines — automotive oil can cause clutch slippage.
  • If the cam chain tensioner push rod bolt was removed by mistake, consult a Honda dealer for re-installation and adjustment.
  • Always dispose of used engine oil responsibly.

Keeping your 2018 Honda CRF50F’s oil fresh is the easiest way to ensure years of reliable performance and smooth operation. Always consult your owner’s manual for any updates or variations, and rely on MotoSport.com for authentic supplies and tools.

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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.